3 years ago

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Mathematics

1 answer:

galina1969 [7]3 years ago

4 0

The correct answer choice is (B)

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What is the value of y in the equation 4y-2(1-y)=-44?

LUCKY_DIMON [66]

Hi there!

$\large\boxed{y = -7}$

4y - 2(1 - y) = -44

Begin by distributing -2:

4y - 2(1) - 2(-y) = -44

Simplify. A negative times a negative equals positive.

4y - 2 + 2y = -44

Combine like terms:

6y - 2 = -44

Add 2 to both sides:

6y = -42

Divide both sides by 6:

y = -7

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4 weeks

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for every 1 week heather learned 5 appetizer recipe

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Dr. Ashby is studying the heart rate of adult men. Preliminary data suggests that the standard deviation of heart rates for adul

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Answer:

n=42 adult men

Step-by-step explanation:

-The minimum sample size to get a desired margin of error, E is calculated using the formula:

$n\geq( \frac{z\sigma}{E})^2$

-Given that $\sigma=7.5, \ \ E=3\ , \ z_{0.005}=2.58$ , we can substitute to solve for n in the above formula:

$n\geq (\frac{z\sigma}{E})^2\\\\\therefore n=(\frac{z_{\alpha/2}\sigma}{E})^2\\\\=(\frac{2.58\times7.5}{3})^2\\\\=41.6025\approx42$

Hence, the desired minimum sample size, n is 42 adult men.

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3 years ago