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xxMikexx [17]
3 years ago
9

I need help you don't have to explain the answer I just need it, thank you!

Mathematics
1 answer:
denpristay [2]3 years ago
6 0

Answer:

j = 10

Step-by-step explanation:

You add 7 to both sides then divide both sides by -2

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Use the elimination method to solve the system of equations. Choose the
sveticcg [70]

Answer:

C. (2, 1)

Step-by-step explanation:

-3y = x-5

x+ 5y = 7

Subtract x from both sides in the first equation. Write the second equation below it.

-x - 3y = -5

x + 5y = 7

Add the two equations above.

2y = 2

Divide both sides by 2.

y = 1

Substitute y with 1 in the second original equation and solve for x.

x + 5(1) = 7

x + 5 = 7

Subtract 5 from both sides.

x = 2

Answer: C. (2, 1)

6 0
3 years ago
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If you want to be 95​% confident of estimating the population mean to within a sampling error of plus or minus3 and the standard
Aleksandr [31]

Answer:

The sample size required is at least 171

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

What sample size is​ required?

A samle size of at least n is required, in which n is found when M = 3, \sigma = 20

So

M = z*\frac{\sigma}{\sqrt{n}}

3 = 1.96*\frac{20}{\sqrt{n}}

3\sqrt{n} = 20*1.96

\sqrt{n} = \frac{20*1.96}{3}

(\sqrt{n})^{2} = (\frac{20*1.96}{3})^{2}

n = 170.7

Rouding up

The sample size required is at least 171

5 0
2 years ago
PLEASE HELP Find the product. (n³)² • (n⁵)⁴​
Papessa [141]

Answer:

n^{26}

Step-by-step explanation:

Raising something to a power to a power simply simply multiplies the two exponents

(n^3)^2 = n^6

(n^5)^4 = n^20

Multiplying two numbers with the same base (n) will add the exponents

n^6 x n^20 = n^26

5 0
2 years ago
The steps below show the incomplete solution to find the value of x for the equation 5x − 3x + 4 = −4 + 20:
matrenka [14]
5x - 3x + 4 = -4 +20
2x + 4 + 16
subtract 4 from each side
2x=12
divide each side by 2
x=6
8 0
3 years ago
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Quadrilateral A'B'C'D'is a rotation of quadrilateral ABCD 180° about the origin.
BigorU [14]
I think the answer is B hope this helps
6 0
2 years ago
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