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4 years ago

How to solve -5x+9y=7 and 5x-4y=-17

Mathematics

2 answers:

Ivenika [448]4 years ago

5 0

Answer is (-5,2)

You would use the elimination method and then you would find y and then plug the number in to find x. If you need help still just tell me.

ICE Princess25 [194]4 years ago

4 0

X=-5
y=-2
(-5,-2) is the correct answer

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Can anyone help me find the area pls ty

love history [14]

Since its a square we put one of the side lengths to the power of 2 3 to the power of 2 equals 9 so the area is 9

7 0

3 years ago

Identify the segment bisector of AB¯¯¯¯¯¯¯¯. Then find AB.

tia_tia [17]

Answer:

is there more to the question? this does not make seince

Step-by-step explanation:

5 0

3 years ago

A researcher wants to estimate the percentage of all adults that have used the Internet to seek pre-purchase information in the

lara31 [8.8K]

Answer:

The sample size is 1875.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

Sampling error of 0.03.

This means that $M = 0.03$

99.74% confidence level

So $\alpha = 0.0026$ , z is the value of Z that has a pvalue of $1 - \frac{0.0026}{2} = 0.9987$ , so $Z = 3$ .

25% of all adults had used the Internet for such a purpose

This means that $\pi = 0.25$

What is the sample size

The sample size is n. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 3\sqrt{\frac{0.25*0.75}{n}}$

$0.03\sqrt{n} = 3\sqrt{0.25*0.75}$

Simplifying by 0.03 both sides

$\sqrt{n} = 100\sqrt{0.25*0.75}$

$(\sqrt{n})^2 = (100\sqrt{0.25*0.75})^2$

$n = 1875$

The sample size is 1875.

7 0

3 years ago

What is the total surface area of the box formed by the pattern below

nadezda [96]

Answer:

<h2>The total surface area of the box is 224 square inches.</h2>

Step-by-step explanation:

The box pattern is shown in the image attached.

The total surface is the sum of the area of each section of the figure, which is formed by 4 equal rectangles and 2 equal squares. Rectangles have dimensions of 12 inches by 4 inches, and squares have 4 inches per side.

So, the total surface would be

$S_{total}=S_{squares} +S_{rectangles}\\ S_{total}=2(4in)^{2} +4(12in \times 4 in)\\ S_{total}=2(16in^{2})+4(48in^{2} ) \\ S_{total}=32in^{2}+192in^{2}\\ S_{total}=224in^{2}$

Therefore, the total surface area of the box is 224 square inches.

8 0

4 years ago

Use the distributive property to expand 2(6x-5y)-7

Andrews [41]

2 x 6x - 2 x 5y - 7
12x - 10y - 7

7 0

4 years ago