Mathematics High School

## Answers

**Answer 1**

**Answer:**

14.8

**Step-by-step explanation:**

4(2)+3.4(2)

8+6.8

14.8

## Related Questions

find the value of X what is the value of X?

### Answers

[tex] \sqrt{36 - 25} = \sqrt{11} \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ [/tex]

A car dealership sells 200 vehicles in the month of June and then sells1 4 more vehicles in the month of July. This can be modeled by the numerical expression 200 1 4 (200). Simplify the expression to find how many cars were sold in July. The dealership sold cars in July.

### Answers

We need to simplify the given **expression** (200 × 1.07) to find how many cars were sold in July. 200 × 1.07= 214. This means that the **dealership **sold 214 vehicles in the month of July.

A car dealership sells 200 **vehicles **in the month of June and then sells1 4 more vehicles in the month of July. This can be modeled by the numerical expression 200 1 4 (200). Simplify the expression to find how many cars were sold in July. The dealership sold cars in July.

As given that in the month of June the car dealership sold 200 vehicles and in the month of July, it sold 14 more vehicles than the June month, we can represent this with the help of the numerical expression,200 + 14 = 214.

Now, we need to simplify the given expression (200 × 1.07) to find how many cars were sold in July. 200 × 1.07= 214.

This means that the dealership sold 214 vehicles in the month of July.

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if ssr = 47 and sse = 12, what is r?

### Answers

If SSR = 47 and SSE = 12, the **correlation **coefficient R is approximately ±0.8925.

HTo find the coefficient of determination (R-squared or R²) using SSR** (Sum of Squares Regression)** and SSE (Sum of Squares Error), you'll first need to calculate the total **sum of squares** (SST), and then use the formula R² = SSR/SST. Here are the steps:

1. Calculate SST: SST = SSR + SSE

In this case, SST = 47 + 12 = 59

2. Calculate R²: R² = SSR/SST

For this problem, R² = 47/59 ≈ 0.7966

Since R (correlation coefficient) is the square root of R², you need to take the square root of 0.7966. Keep in mind, R can be either positive or negative depending on the direction of the relationship between the variables. However, since we do not have information about the direction, we'll just provide the absolute value of R:

3. Calculate R: R = √R²

In this case, R = √0.7966 ≈ 0.8925

So, if SSR = 47 and SSE = 12, the **correlation **coefficient R is approximately ±0.8925.

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the demand for a product is = () = √300 − where x is the price in dollars.

### Answers

Based on the information provided, the demand for a product is given by the **function **D(x) = √300 - x, where x represents the price in dollars. In this function, the demand is expressed as a relationship between the price and the quantity of the product that consumers are willing to purchase.

To answer your question, let's first understand what demand for a product means. Demand refers to the **quantity **of a product that consumers are willing to buy at a particular price point. Typically, the higher the price of a product, the lower the demand for it. Now, coming back to your equation, the demand for a product is equal to √300 minus the price in dollars. So, if we put this equation into words, we can say that the demand for the product decreases as the price of the product increases. To put this into numbers, let's assume that the price of the product is 10 dollars. Substituting this value into the equation, we get the demand for the product as √300 - 10, which is equal to approximately 14 units. However, if the price of the product increases to 20 dollars, the demand will decrease to √300 - 20, which is equal to approximately 12 units. Therefore, the higher the price, the lower the demand for the product. In summary, this equation helps us understand the relationship between the price and demand for a product, and we can use it to make informed decisions regarding **pricing strategies**.

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determine whether the following series converges or diverges. if the series converges, compute its sum. clearly justify your answer: x1 n=1 3n 141 3n22n

### Answers

To evaluate the **series **Σ(3^n/(141·3²ⁿ) from n=1 to infinity converges or diverges, we can use the ratio test.

The ratio test states that if the **limit **of the absolute value of the **ratio **of consecutive terms is less than 1, then the series converges absolutely;

if the limit is greater than 1, then the series diverges; and if the limit is exactly 1, then the test is inconclusive.

Let's first apply the ratio test to this series:

| (3ⁿ+¹/(141·3²ⁿ+¹) * (141·3²ⁿ))/(3ⁿ |

= | 3/141 |

= 1/47

Since the limit of the absolute value of the ratio of consecutive terms is less than 1, the series converges absolutely.

To compute the sum of the series, we can use the formula for the sum of a geometric series:

Σ(3ⁿ/(141·3²ⁿ) = 3/141 Σ(1/9)ⁿ from n=1 to infinity

= (3/141) · (1/(1-(1/9)))

= 27/470

Therefore, the series converges absolutely and its sum is 27/470.

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3500 randomly chosen voters are asked in a national poll if they approve of the job the president is doing. Which best describes a sampling distribution of the sample proportion in this situation? A sample of 500 voters obtained to predict that true proportion of voters who approve of the president. The proportions who approve of the president within all possible samples of this size The proportion of these 3500 voters who approve the president The proportion of all voters who approve the president

### Answers

The answer is ,the best description of the **sampling distribution** of the sample **proportion **is the "proportions who approve of the president within all possible samples of this size".

The proportion who approves of the president within all possible samples of this size best describes the sampling distribution of the sample proportion in this situation.

Suppose the true proportion of voters who approve of the president is p.

Then, the distribution of the sample proportions is called a sampling distribution.

The** central limit theorem** indicates that the sampling **distribution **will be normally distributed if the sample size is large enough.

In this case, the sample size is 3500 voters, which is considered a large **sample size**.

Therefore, the sampling distribution of the sample proportion will be normally distributed.

The best description of the sampling distribution of the sample proportion is the "proportions who approve of the president within all possible samples of this size".

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Question 9 of 10 Select the two values of x that are roots of this equation. 2x-3 = -5x² A. X = T NIM B. X= // 5 □ C. x = 1/3 D. X = -1 SUBMIT

### Answers

The **roots** of the equation 2x - 3 = -5x² are x = -1 and x = 3/5. Therefore, the correct options are (B) and (D).

To find the roots of the **equation** 2x - 3 = -5x², we need to solve the equation and determine the values of x that satisfy it.

Rearranging the equation, we have -5x² - 2x + 3 = 0.

To solve this quadratic equation, we can either factor it or use the quadratic formula. Let's use the quadratic formula:

x = (-b ± √(b² - 4ac)) / (2a)

For the equation -5x² - 2x + 3 = 0, the **coefficients** are:

a = -5, b = -2, c = 3.

Plugging these values into the **quadratic** formula, we get:

x = (-(-2) ± √((-2)² - 4(-5)(3))) / (2(-5))

x = (2 ± √(4 + 60)) / (-10)

x = (2 ± √64) / (-10)

x = (2 ± 8) / (-10)

Simplifying further:

x = (2 + 8) / (-10) or x = (2 - 8) / (-10)

x = 10 / (-10) or x = -6 / (-10)

x = -1 or x = 3/5

Therefore, the roots of the equation 2x - 3 = -5x² are x = -1 and x = 3/5.

Among the given options, the correct answers are:

D. x = -1

B. x = 3/5

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Circles: Q1: Farmer Joe wants to put in a rose bush for Mrs. Farmer Joe. The rose bush will have a diameter of 3 feet but needs 1 foot of clearance around it inside of its fence. How much fence will he need? Q2: Farmer Joe bought a bag of special rose fertilizer that covers 35 sq. feet. Will he have enough fertilizer for the rose bush?

### Answers

Q1. Farmer Joe will need approximately 15.71 feet of fence to enclose the rose bush with 1 foot of clearance.

Q2. the **area **of the rose bush bed is approximately 7.07 square feet, and the fertilizer bag covers 35 square feet, Farmer Joe will have more than enough fertilizer for the rose bush.

Q1: To calculate the **amount **of fence Farmer Joe will need for the rose bush, we need to consider the perimeter of the circular fence.

The diameter of the rose bush is 3 feet, so the radius (half of the diameter) is 3/2 = 1.5 feet. Since he needs 1 foot of clearance around the bush, the radius of the circular fence will be 1.5 + 1 = 2.5 feet.

The formula for the circumference (perimeter) of a circle is C = 2πr, where π is a **mathematical **constant approximately equal to 3.14159. Plugging in the value of the radius, we get:

C = 2 * 3.14159 * 2.5 = 15.70795 feet.

Therefore, Farmer Joe will need approximately 15.71 feet of fence to enclose the rose bush with 1 foot of clearance.

Q2: The fertilizer bag covers an area of 35 square feet. To determine if it will be enough for the rose bush, we need to calculate the area of the **circular **bed where the rose bush will be **planted**.

The area of a circle is given by the formula A = πr^2. Plugging in the value of the radius (1.5 feet), we have:

A = 3.14159 * (1.5)^2 = 3.14159 * 2.25 = 7.06858 square feet.

Since the area of the rose bush bed is approximately 7.07 square feet, and the fertilizer bag covers 35 square feet, Farmer Joe will have more than enough fertilizer for the rose bush.

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What is the surface area of this right triangular prism?

### Answers

**Answer:**

1200 in²

------------------------

Find the **perimeter **of the triangular base and multiply it **by the height**.

S = PhS = (17 + 17 + 30)*15S = 64*15S = 960 in²

Find the area of **triangular bases**:

B = (1/2)*8*30 = 120 in²

Add up the two bases to the lateral area to get the **total surface area**:

A = 960 + 2*120A = 1200 in²

Total surface area is **1200 in²**.

the observed relationship between the masses of central black holes and the bulge masses of galaxies implies that

### Answers

The masses of central **black holes** in galaxies are correlated with the bulge masses of those galaxies.

This correlation suggests that there is a connection or relationship between growth of a **galaxy's** central black hole and growth of its bulge.

Specifically, observations have shown that galaxies with more massive bulges tend to have more massive central black holes.

This implies that the growth of the central black hole and the growth of the bulge are linked or influenced by similar processes or mechanisms.

The exact nature of this relationship is still an active area of research in astrophysics.

Various theories and models have been proposed to explain the observed **correlation**.

Including the idea that the growth of the central black hole and the bulge are regulated by feedback mechanisms.

Involving the accretion of matter onto the black hole and the release of energy in the form of radiation or outflows.

The observed relationship between the masses of central black holes and the bulge masses of galaxies provides,

Valuable insights into the co-evolution of galaxies and their central supermassive black holes.

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HELPPPPPP MATH QUESTION

### Answers

The situation which can be represented by the **graph **is the relationship between price and **supply** in **economics **which have a directly proportional relationship.

How is this so?

In Economics, where all things are equal, the quantity of goods supplied represented by the** x-axis** increased as the price of the commodities increased.

Note that the price is represented or usually plotted on the **Y-axis.**

Thus, it is correct to depict such a situation with the above **graph**.

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ASNWER RN PLSSSS 20 POINTS!

Mrs. W is raising bunnies for Easter. She currently has 5 bunnies and expects the number of bunnies to increase 55% each year. Approximately how many bunnies would Mrs. W have after 5 years have passed? ( Round to the nearest bunny)

### Answers

Answer:

20 bunnies mrs w would have

**The answer 44 I took a quiz and that was the answer.**

cassie can run 100 meters in 24.73 seconds. how many ninutes would it take cassie to run 1 kilometer?

### Answers

Answer:

22,281.73

Step-by-step explanation:

1 kilometer = 1000 Meters

Subtract the 100 meters you already have from 1000.

Multiply 900 times 24.73

Add 22,257 to 24.73

= 22,281.73

Determine the value of x and y in:(4+2i)(x+yi)+(3-2i)=9-4i

### Answers

the **values** of x and y that satisfy the given **equation** are x = 1 and y = -1.

To determine the values of x and y in the equation:

(4+2i)(x+yi) + (3-2i) = 9-4i

We can expand the left side of the equation using the **distributive** property:

(4x + 2ix + 4yi - 2y) + (3 - 2i) = 9 - 4i

Group the real and **imaginary** terms together:

(4x - 2y + 3) + (2ix + 4yi - 2i) = 9 - 4i

Now, equating the real parts and imaginary parts on both sides of the equation, we have:

Real Part:

4x - 2y + 3 = 9

Imaginary Part:

2ix + 4yi - 2i = -4i

From the real part equation, we can solve for x and y:

4x - 2y = 9 - 3

4x - 2y = 6

2x - y = 3 (Dividing by 2)

From the imaginary part equation, we can solve for x and y:

2ix + 4yi - 2i = -4i

2ix + 4yi = -4i + 2i

2ix + 4yi = -2i

2x + 4y = -2 (Dividing by i)

Now, we have a system of linear equations:

2x - y = 3

2x + 4y = -2

To solve this system, we can use the method of substitution or elimination. Let's use the elimination method:

Multiply the first equation by 2 to eliminate the x term:

(2)(2x - y) = (2)(3)

4x - 2y = 6

Now, subtract the second equation from the modified first equation:

(4x - 2y) - (2x + 4y) = 6 - (-2)

4x - 2x - 2y - 4y = 6 + 2

2x - 6y = 8

Simplifying further, we get:

2x - 6y = 8 ---(3)

Now, we have two equations:

2x + 4y = -2 ---(2)

2x - 6y = 8 ---(3)

Multiply equation (2) by 3 and equation (3) by 2 to eliminate the x term:

(3)(2x + 4y) = (3)(-2)

(2)(2x - 6y) = (2)(8)

6x + 12y = -6 ---(4)

4x - 12y = 16 ---(5)

Add equations (4) and (5) to **eliminate** the y term:

(6x + 12y) + (4x - 12y) = -6 + 16

10x = 10

x = 10/10

x = 1

Substitute the value of x back into equation (2):

2(1) + 4y = -2

2 + 4y = -2

4y = -2 - 2

4y = -4

y = -4/4

y = -1

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Find all angles between 0 and 2π satisfying the condition cosx=1/2

### Answers

All **angles **lying** **between 0 and 2π satisfying the **condition** cos x = 1/2 are π/3 and 5π/3. These angles are mainly: π/3, 5π/3 + 2π, and 5π/3 + 4π, and can be simplified to: π/3, 11π/3, and 19π/3.

Given the condition cos x = 1/2, we know that the angle x must be one of the angles for which cos is equal to 1/2, which are π/3 and 5π/3. However, the range of x is 0 ≤ x ≤ 2π. Therefore, we must find all the angles in this range that satisfy the given condition. These angles are: π/3, 5π/3 + 2π, and 5π/3 + 4π, which simplifies to: π/3, 11π/3, 19π/3.

Since 11π/3 and 19π/3 are greater than 2π, we need to subtract 2π from each to get them into the range 0 ≤ x ≤ 2π, which gives: π/3 and 5π/3 as the solutions in this range.

Therefore, all angles between 0 and 2π satisfying the condition, cos x= 1/2 are:π/3 and 5π/3.

We know that cos x is periodic, with a period of 2π, and that its value is equal to 1/2 at two different angles in the interval [0, 2π), which are π/3 and 5π/3. Since we are asked to find all angles that satisfy the condition cos x = 1/2 in this interval, we must add 2π to the second solution, which gives us 11π/3.

However, this is greater than 2π, so we must subtract 2π to get it into the desired range, which gives us 5π/3. Similarly, we must add 4π to the second solution, which gives us 19π/3. However, this is also greater than 2π, so we must subtract 2π to get it into the desired range, which gives us 11π/3.

Therefore, the solutions in the interval [0, 2π) are π/3 and 5π/3. These are the only solutions in this interval since the **cosine function** has a maximum value of 1 and a minimum value of -1, so it can only equal 1/2 at two angles between 0 and 2π. Thus, all angles between 0 and 2π satisfying the condition cos x = 1/2 are π/3 and 5π/3.

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Find a power series representation centered at 0 for the following function using known power series. Give the interval of convergence for the resulting series.

F(x)=1/(1+x^6)

what is the power series representation for f(x)?

what is the interval of convergence?

### Answers

Our power series is F(x) = ∑(n=0 to ∞) of (-1)ⁿ × x⁶ⁿ.The interval of convergence for the power series **representation** of F(x) is -1 < x < 1.

How to find interval of convergence of function?

To find the power** series **representation for the function F(x) = 1/(1 + x⁶), we can use the geometric series formula.

The geometric series formula states that for |r| < 1, the series ∑(n=0 to ∞) of rⁿ converges to 1/(1 - r).

In this case, we can rewrite F(x) as:

F(x) = 1/(1 + x⁶) = (1 - (-x⁶))⁻¹

Now, we can see that this is a geometric series with r = -x⁶. Using the geometric series formula, we can express F(x) as a power series:

F(x) = (1 - (-x⁶)⁻¹) = ∑(n=0 to ∞) of (-x⁶)ⁿ

Expanding this series, we get:

F(x) = ∑(n=0 to ∞) of (-1)ⁿ × x⁶ⁿ)

So, the power series representation for F(x) is:

F(x) = ∑(n=0 to ∞) of (-1ⁿ) × x⁶ⁿ

To determine the interval of **convergence **for this power series, we need to find the values of x for which the series converges.

The interval of convergence is determined by the radius of convergence, which can be found using the ratio test. The ratio test states that for a power series ∑(n=0 to ∞) of a_n × (x - c)ⁿ, the series converges if the limit of |a_(n+1) / a_n| as n approaches infinity is less than 1.

In this case, our power series is:

F(x) = ∑(n=0 to ∞) of (-1)ⁿ × x⁶ⁿ

Using the ratio test, we have:

|((-1)ⁿ⁺¹ × x⁶[tex]^([/tex]ⁿ⁺¹[tex]^)[/tex]) / ((-1)ⁿ × x⁶ⁿ)| = |(-1) × x⁶| = |x⁶|

The limit of |x⁶| as n approaches infinity is |x⁶|. For the series to converge, |x⁶| must be less than 1. Therefore, the interval of convergence is:

|x⁶| < 1

which implies:

-1 < x⁶ < 1

Taking the sixth root of each **inequality**, we have:

-1 < x < 1

So, the interval of convergence for the power series representation of F(x) is -1 < x < 1.

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Find m of arc JA

See photo below

### Answers

The **measure** of the **arc angle** JA is 76 degrees.

How to find the arc angle JA?

The sum of** angles** in a cyclic quadrilateral is 360 degrees. The opposite angles in a** cyclic quadrilateral **is supplementary.

The **measure** of an arc intercepted by an angle of a quadrilateral that is inscribed in a circle is equal to two times the measure of the inscribed angle.

Therefore,

26x + 1 = 1 / 2 (18x + 4 + 6 + 32x)

26x + 1 = 1 / 2 (50x + 10)

26x + 1 = 25x + 5

26x - 25x = 5 - 1

x = 4

Therefore,

arc angle JA = 18x + 4

arc angle JA = 18(4) + 4

arc angle JA =72 + 4

arc angle JA = 76 degrees.

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Find the best point estimate for the ratio of the population variances given the following sample statistics. Round your answer to four decimal places. n1=24 , n2=23, s12=55.094, s22=30.271

### Answers

The best point estimate for the **ratio** of population variances can be calculated using the F-statistic:

F = s1^2 / s2^2

where s1^2 is the sample variance of the first population, and s2^2 is the sample **variance** of the second population.

Given the sample statistics:

n1 = 24

n2 = 23

s1^2 = 55.094

s2^2 = 30.271

The F-**statistic** can be calculated as:

F = s1^2 / s2^2 = 55.094 / 30.271 = 1.8187

The point **estimate** for the ratio of population variances is therefore 1.8187. Rounded to four decimal places, the answer is 1.8187.

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Two sides of a triangle have the following measures. Find the range of possible measures for the third side (x).

5, 8

### Answers

The **Range** of C lies **between** in the **interval** 3 < x < 13.

We apply the this **theorem**:

A **triangle** with sides A, B and C the sum of the **lengths** of any two sides of a triangle must be **greater** than the third side:

1. A + B > C

2. B + C > A

3. A + C > B

Now, According to the question:

We have the two **sides** of triangle :

First measure of **length** of triangle is 5

and, second measure of length of **triangle** is : 8

We have to the find the range of** possible measures** for the third side (x).

Thus given two sides of A= 5 and B = 8 and C can be:

8 - 5 < x < 8 + 5

3 < x < 13

Hence, **Range** of C lies between in the interval 3 < x < 13.

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Apply Runge-Kutta method of second order to find an approximate value of y when x=0.02, for first order initial value problem [10 Marks] y = x² + y, y(0) = 1. Assume step-size (h) as 0.01. Apply Runge-Kutta method of second order to find an approximate value of y when x=0.02, for first order initial value problem y = x² + y, y(0) = 1. Assume step-size (h) as 0.01.

### Answers

Using the **Runge-Kutta** method of second order, the approximate value of y when x = 0.02 is is 1.0203045100525125.

How to apply the Runge-Kutta method of second order to approximate the value of y when x = 0.02?

To apply the Runge-Kutta method of **second order** to approximate the value of y when x = 0.02, we can follow these steps:

[tex]y' = x^2 + y[/tex]

y(0) = 1

h = 0.01 (step size)

x = 0.02 (desired x-value)

The general formula for the second-order **Runge-Kutta** method is:

y(i+1) = y(i) + (k1 + k2)/2

where

k1 = h * f(x(i), y(i))

k2 = h * f(x(i) + h, y(i) + k1)

Let's calculate the values step by step:

Set x(0) = 0, y(0) = 1.

k1 = h * f(x(0), y(0))

[tex]= 0.01 * (0^2 + 1)[/tex]

= 0.01

k2 = h * f(x(0) + h, y(0) + k1)

[tex]= 0.01 * ((0 + 0.01)^2 + 1 + 0.01)[/tex]

= 0.01 * (0.0001 + 1.01)

= 0.010101

y(1) = y(0) + (k1 + k2)/2

= 1 + (0.01 + 0.010101)/2

= 1 + 0.020101/2

= 1.0100505

Let's perform the calculations iteratively:

Iteration 1:

x = 0.01

y = 1.0100505 (from Step 4)

Iteration 2:

Now we need to repeat steps 2-4 with the new x and y values:

k1 = h * f(x(1), y(1))

[tex]= 0.01 * (0.01^2 + 1.0100505)[/tex]

= 0.0102010050025

k2 = h * f(x(1) + h, y(1) + k1)

[tex]= 0.01 * ((0.01 + 0.01)^2 + 1.0100505 + 0.0102010050025)[/tex]

= 0.010307015102525

y(2) = y(1) + (k1 + k2)/2

= 1.0100505 + (0.0102010050025 + 0.010307015102525)/2

= 1.0203045100525125

After the second **iteration**, when x = 0.02,

we obtain y ≈ 1.0203045100525125.

Therefore, the approximate value of y when x = 0.02 using the Runge-Kutta method of second order is 1.0203045100525125.

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Gayle installed a rectangular section of hardwood flooring measuring 12 ft by 12 ft in her family room. She plans on increasing the area of the flooring to 256 ft2 by increasing the width and length by the same amount, x. Which equation can be used to find x?

A. 256=(12+x)(12+x)

B. 256=(12−x)(12−x)

C. 256=12(12+x)

D. 256=12(12−x)

### Answers

Given information:Gayle installed a **rectangular** section of **hardwood **flooring measuring 12 ft by 12 ft in her family room. She plans on increasing the area of the flooring to 256 ft2 by increasing the width and length by the same amount, x.

Formula for the** area** of a rectangular is given as follows:Area of a rectangular = Length × WidthLet, the width and length of the rectangular be x.So, the area of the rectangular after increasing the **width and length** by the same amount will be:(12 + x) × (12 + x)According to the question, the area of the rectangular after increasing the width and length by the **same amount **is 256.So, the equation that represents the given situation is:256 = (12 + x) × (12 + x)256 = (12 + x)²Answer:Option A: 256 = (12 + x) × (12 + x) is the correct equation to find x.

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Four vectors drawn froth a common point are given as follows: A= 2a1 - ma2 - a3 B = ma1 + a2 ? 2a3 C = a1+ ma2 + 2a3 D = m^2a3 + ma2 + a3 Find the value(s) of m. for each of the following cases: (a) A is perpendicular to B; (b) B is parallel to C; (c) A,B, and C lie in the same plane; and (d) D is perpendicular to both N and B

### Answers

To find the **values** of m for each case, we need to analyze the given **vectors**. For case (a), m can be either 1 or 2. For case (b), m = 1. For case (c), m = 5/4. For case (d), m can be ±1.

In case (a), we determine that A is **perpendicular** to B by taking their dot product and equating it to zero. This leads to a **quadratic** **equation** in terms of m, which we can solve to find two possible values of m. In case (b), we determine that B is parallel to C by cross-checking the ratios of their corresponding components. By equating these ratios, we obtain a linear equation in terms of m, which we can solve to find the value of m. In case (c), we determine if A, B, and C lie in the same plane by checking if their cross product is zero. This leads to a linear equation in terms of m, and solving it provides the value of m. In case (d), we find that D is perpendicular to both N and B by taking their dot products. By solving the resulting equations, we can determine the value of m.

(a) For A to be perpendicular to B, their **dot product** should be zero: A · B = (2a1 - ma2 - a3) · (ma1 + a2 ? 2a3) = 0

Expanding the dot product and simplifying, we obtain the quadratic equation:

2m - 2m² + 4 = 0

Solving this quadratic equation yields two possible values for m: m = 1 and m = 2.

(b) To determine if B is parallel to C, we compare their corresponding components: ma1 + a2 ? 2a3 = k(a1 + ma2 + 2a3), where k is a constant. By equating the ratios of corresponding components, we get:

m = k

1 = mk

-2 = 2k

From the first two equations, we find m = 1, and substituting this into the third equation, we see that k = -1.

(c) To check if A, B, and C lie in the same **plane**, we need to determine if their cross product is zero:

(A × B) · C = 0

Expanding and simplifying the cross product, we obtain:

(2a2 + 4a3 + ma1) · (a1 + ma2 + 2a3) = 0

Simplifying further and rearranging terms, we get the linear equation:

4m - 5 = 0

Solving this equation yields m = 5/4.

(d) For D to be perpendicular to both N and B, their dot products should be zero:

D · N = (m²a3 + ma2 + a3) · (N1a1 + N2a2 + N3a3) = 0

D · B = (m²a3 + ma2 + a3) · (ma1 + a2 - 2a3) = 0

Expanding the dot products and simplifying, we obtain two **linear** **equations**: m² + 1 - 3m = 0

m² - 1 = 0

Solving these equations, we find m = ±1.

In summary, for case (a), m can be either 1 or 2. For case (b), m = 1. For case (c), m = 5/4. For case (d), m can be ±1.

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2. use the elimination method to solve the system y′′1 = 2y1 y2 t, y′′2 = y1 2y2 −et.

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It seems that you're asking about solving a system of differential equations using the **elimination method**. Unfortunately, the elimination method is used for solving systems of linear equations, not differential equations. The given system consists of second-order nonlinear differential equations.

To use the elimination method to** solve** the system:

1. Start by multiplying the first equation by y2 and the second equation by -y1.

2. This gives us:

y′′1y2 = 2y1y2t

-y′′2y1 = -y12y2et

3. Now we can add the two equations together:

y′′1y2 - y′′2y1 = 2y1y2t + y12y2et

4. This simplifies to:

(y1y2)'' = 2y1y2t + y12y2et

5. Finally, we can integrate both sides to get the solution:

y1y2 = ∫(2t + e-t) dt

y1y2 = t2 - e-t + C

where C is a constant of integration.

Therefore, the solution to the system using the elimination method is:

y1y2 = t2 - e-t + C

For such problems, you may want to consider using numerical methods like Euler's method or Runge-Kutta methods to obtain approximate solutions, or consult with a specialist in differential equations to explore other possible techniques for solving the given **system**.

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**Main Answer:**To **solve this equation,** we need** an initial condition or boundary condition to determine** the specific **solution**. Once we have the solution for z, we can substitute it back into **the first equation** (y′′ = 2yzt) to find the solution for y.

**Supporting Question and Answer:**

**How do we solve a system of differential equations using the elimination method?**

To solve a system of differential equations using **the elimination method**, we **differentiate **the equations and manipulate them to eliminate **one variable** at a time. This allows us to express one variable in **terms** of the other variables,** reducing the system** to a** simpler set** of equations.

**Body of the Solution: **To solve the system of differential equations using the elimination method, we will eliminate one variable at a time by differentiating the equations. Let's denote y₁ as y and y₂ as z for simplicity.

Given system:

y′′ = 2yzt z′′ = 2yz - e^t

Step 1: Differentiate the first equation with respect to t. y′′′ = 2(z′t + z) + 2yzt

Step 2: Substitute the value of y′′′ into the second equation. 2(z′t + z) + 2yzt = 2yz - e^t

Simplifying the equation:

2z′t + 2z + 2yzt = 2yz - e^t

Step 3: Rearrange the terms to isolate z′.

2z′t + 2z - 2yz + e^t = 0

Step 4: **Divide** the equation by 2t to isolate z′.

z′ + z/t - y + e^t/2t = 0

This equation represents a** first-order linear differential equation** in terms of z.

**Final Answer:The single required equation is: ** z′ + z/t - y + e^t/2t = 0

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Need help with my geometry homework pls

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**Answer:**

what is the question at hand?

**Step-by-step explanation:**

I'll gladly solve if you can provide a question?

Ellen's weight has a z-score of -1.9. What is the best interpretation of this z-score? Ellen's weight is 1.9 standard deviations below the median weight. Ellen's weight is 1.9 pounds below the mean weight. Ellen's weight is 1.9 pounds below the median weight Ellen's weight is 1.9 standard deviations below the mean weight.

### Answers

The best interpretation of **Ellen's** z-score of -1.9 is that her weight is 1.9 standard deviations below the mean **weight**. This means that her weight is significantly lower than the average weight for individuals in the population.

The standard deviation is a measure of how much the values in a **dataset** vary from the mean, and a negative z-score indicates that Ellen's weight is below the mean. The value of -1.9 means that her weight is farther from the mean than about 97.7% of the values in the dataset, as approximately 2.5% of the values fall on each side of the mean in a normal distribution.It is important to note that the z-score only tells us how far away a value is from the mean in terms of standard deviations, and does not provide information about the **actual** value itself. Therefore, we cannot determine Ellen's actual weight from this z-score alone. Additionally, it is incorrect to interpret the z-score as being in terms of **pounds**, as the standard deviation is a unit of measurement used to describe variability, and may not **necessarily** correspond to a specific weight or measurement.

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6). positive integer n is the product of the odd numbers from 99 to 199, inclusive. if n is divisible by 5k , what is the greatest possible value of k?

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The greatest possible value of k such that n is **divisible** by 5k is 39.

What is odd number?

Any **number** that cannot be divided by two is considered an odd number. For instance, 25 is strange because it cannot be split by 2. A integer is considered to be divisible by two if its last digit is any of the following: 0, 2, 4, 6, or 8.

To find the **greatest possible value** of k such that n is divisible by 5k, we need to determine the highest power of 5 that divides n.

The product of the **odd numbers** from 99 to 199, inclusive, can be expressed as:

n = 99 * 101 * 103 * ... * 197 * 199

To find the **power** of 5 that divides n, we need to determine the number of factors of 5 in the product.

A factor of 5 is introduced for every multiple of 5 in the product. We need to count the multiples of 5 in the range from 99 to 199.

The largest **multiple** of 5 in that range is 195, which is 39 * 5.

Therefore, there are 39 multiples of 5 in the product.

To find the highest power of 5 that divides n, we divide 39 by k and find the largest possible integer value for k.

The largest possible value of k is the largest **factor** of 39.

The factors of 39 are 1, 3, 13, and 39.

Since we are looking for the greatest possible value of k, the answer is 39.

Therefore, the greatest possible value of k such that n is **divisible** by 5k is 39.

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A survey is taken at a mall in Westingbrook. The first 300 people who entered the mall were asked about their favorite restaurant in the food court. What is true about this situation?

The population is the first 300 people at the mall, and the sample is the total number of people who go to the mall.

The population is the number of people who go to the mall, and the sample is the number of people in the town of Westingbrook.

The population is the total number of people who go to the mall, and the sample is the first 300 people at the mall.

The population is the number of people in the town of Westingbrook, and the sample is the number of people who go to the mall.

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The correct option is "The** population** is the total number of people who go to the mall, and the sample is the first 300 people at the mall."

The total number of people who visit the mall in this instance constitutes the population, which is the complete group of people we are interested in investigating or drawing conclusions about. The first 300 people to visit the mall were **surveyed** about their favourite food court restaurant, whereas the sample, on the other hand, refers to a subset of the population chosen to reflect the population and to provide information about it.

It's crucial to keep in mind that the 300-person sample might not **accurately** reflect the whole population of mall-goers, since some demographic groups might be more inclined to attend the mall at particular times of the day or week. However, the surveyors made an effort to reduce any bias that might have affected the sample by choosing **individuals** at random from the first 300 persons to enter the mall.

In addition, the study only asks respondents about their favourite restaurant in the food court, thus it might not be able to give a complete picture of their dining **preferences**. The survey's findings may still be helpful in deciding what kinds of restaurants to include in the food court or in determining the level of popularity of particular eateries.

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What is the volume of the composite figure? Use 3.14 for Pi. Round to the nearest hundredth.

A cylinder and cone. Both have a radius of 4 centimeters. The cone has a height of 8 centimeters and the cylinder has a height of 7 centimeters.

Recall the formulas V = B h and V = one-third B h

242.83 cubic centimeters

309.81 cubic centimeters

334.93 cubic centimeters

485.65 cubic centimeters

### Answers

The **volume **of the composite figure of the **cylinder **and the cone is 485.65 cm³

Given a **composite figure**.

It consists of a cylinder and a cone.

Volume of cylinder = π r² h, where r is the radius and h is the **height **of the cylinder.

Here r = 4 cm and h = 7 cm

Volume of cylinder = π (4)² (7)

= 112π cm³

Volume of the **cone **= 1/3 π r² h, where r is the radius and h is the height of the cone.

Here r = 4 cm and h = 8 cm

Volume of cylinder = 1/3 π (4)² (8)

= 42.67π cm³

Total volume = 112π cm³ + 42.67π cm³

= 154.67π cm³

= 485.65 cm³

Hence the volume is 485.65 cm³.

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**Answer:**

D

**Step-by-step explanation:**

In Exercises 1-12, using induction, verify that each equation is true for every positive integer n

1.)1 +3+5+....+(2n-1)=n^2

### Answers

By **mathematical induction**, the equation 1 + 3 + 5 + ... + (2n - 1) = n² is true for every positive **integer** n.

Using mathematical induction, we can verify that the **equation **1 + 3 + 5 + ... + (2n - 1) = n² is true for every positive **integer **n.

Base case (n=1): 2(1) - 1 = 1, and 1² = 1, so the equation holds for n=1.**Inductive **step: Assume the equation is true for n=k, i.e., 1 + 3 + ... + (2k - 1) = k². We must prove it's true for n=k+1.

Consider the sum 1 + 3 + ... + (2k - 1) + (2(k+1) - 1). By the inductive hypothesis, the sum up to (2k - 1) is equal to k². Thus, the new sum is k² + (2k + 1).

Now, let's examine (k+1)²: (k+1)² = k² + 2k + 1.

Comparing the two expressions, we find that they are equal: k^2 + (2k + 1) = k² + 2k + 1. Therefore, the equation holds for n=k+1.

By mathematical induction, the equation 1 + 3 + 5 + ... + (2n - 1) = n² is true for every positive integer n.

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A glass full of juice weighs 1kg and half-full weighs 3/4th of a kg. What is the weight of the glass?

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Answer : 500 grams, or 1/2 of a kg

If half a glass of juice weighs 1/4 of a kilogram, and there are 2 halves to a full glass of juice, 2/4 of a kilogram must be taken away from 1kg, leaving 2/4 or 1/2 of a kilogram. One kilogram is 1000 grams, meaning the glass would weight 500 grams (half of 1000).