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4 years ago

Is 2y=-8x a direct variation

1 answer:

8 0

Yes. y=kx is the direct variation formula. y=-4x is the simplified form of your equation, which is direct because it fits in the y=kx style.

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The Lee family buys a new car that has a sales price of $35,000. If the car dealer requires a minimum down payment of 15%, what

Kruka [31]

The answer is B!

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3 years ago

Can somebody please help me with these 2 problems?

andrew11 [14]

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4 years ago

9(k+12)+4k2 when k= 3 the 2 is small

Advocard [28]

Answer:

the answer is 4k^2+9k+108

Step-by-step explanation:

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3 years ago

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4 years ago

Read 2 more answers

Suppose that a researcher is planning a new study on hemoglobin levels amongst women under 25 years old. Previous research sugge

Mariulka [41]

Answer:

A sample size of at least 531 is required.

Step-by-step explanation:

We are lacking the confidence level to solve this question, so i am going to use a 90% confidence level.

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

$\alpha = \frac{1-0.9}{2} = 0.05$

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 $1-0.05 = 0.95$ , so $z = 1.645$

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.

Find the required sample size for the new study.

A sample size of at least n is required.

n is found when $M = 0.05$

We have that $\sigma = 0.7$

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

$0.05 = 1.645*\frac{0.7}{\sqrt{n}}$

$0.05\sqrt{n} = 1.645*0.7$

$\sqrt{n} = \frac{1.645*0.7}{0.05}$

$(\sqrt{n})^{2} = (\frac{1.645*0.7}{0.05})^{2}$

$n = 530.4$

Rounding up

A sample size of at least 531 is required.

5 0

3 years ago