3 years ago

12 points !!! Will mark brainliest Help please

Mathematics

1 answer:

ss7ja [257]3 years ago

3 0

Answer:

the 4th one

Step-by-step explanation:

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Julie has three boxes of pens. The diagram shows expressions for the number of pens in each box. Look at these equations.

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Answer:

a = c + 16

Step-by-step explanation:

a = b + 12

b = c + 4

Solve for b in the first equation.

a = b + 12

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Put b as a - 12 in the second equation and solve for a.

a - 12 = c + 4

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4 years ago

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3 years ago

A real estate agent needs to estimate the average value of a residential property of a given size in a certain area. The real es

alexira [117]

Answer:

Follows are the solution to this question:

Step-by-step explanation:

$95 \% \$ the confidence level for z:

$\alpha = 1 - 95 \% \\\\$

$= 1 - 0.95 \\\\ = 0.05$

$\to \frac{\alpha}{2} = \frac{0.05}{2} = 0.025\\\\\\to Z \ \frac{\alpha}{2} = Z_{0.025} = 1.96$

Calculating the Margin of error:

$E = Z\ \frac{\alpha}{2} \times ( \frac{\sigma}{\sqrt{n}})$

$= 1.96 \times ( \frac{5000}{\sqrt{\sqrt{100}}})\\\\= 980$

The population means estimate a 95 % confidence interval is:

$\to \bar{x} \frac{+}{-} E\\\\ = \$ 90000 \frac{+}{-} 980$

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Step-by-step explanation:

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Answer would be: B.) 3/8 cup

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