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3 years ago

Solve x2 = 144. A : 72 B: 12 C: ±12 D : −12

Mathematics

1 answer:

Nuetrik [128]3 years ago

5 0

Answer:

Step-by-step explanation:

72 x 2 = 144

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Are the lines y=x+4 and y=x-2 perpendicular

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Answer:

no they are parallel because the slope is the same they just are at different y- intercepts

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Lower quartile (xL): 16.75

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Upper quartile (xU): 33.5

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What is the Area of a triangle with the height of 0.7 cm and a base of 6cm

Mashcka [7]

Answer: Area = 2.1 $cm^{2}$

Step-by-step explanation:

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2 years ago

A fast food restaurant executive wishes to know how many fast food meals teenagers eat each week. They want to construct a 99% c

Lana71 [14]

Answer:

The minimum sample size required to create the specified confidence interval is 2229.

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:

$\alpha = \frac{1-0.99}{2} = 0.005$

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 $1-0.005 = 0.995$ , so $z = 2.575$

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 is the minimum sample size required to create the specified confidence interval

This is n when $M = 0.06, \sigma = 1.1$

$0.06 = 2.575*\frac{1.1}{\sqrt{n}}$

$0.06\sqrt{n} = 2.575*1.1$

$\sqrt{n} = \frac{2.575*1.1}{0.06}$

$(\sqrt{n})^{2} = (\frac{2.575*1.1}{0.06})^{2}$

$n = 2228.6$

Rounding up

The minimum sample size required to create the specified confidence interval is 2229.

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3 years ago

Identify the function as a growth or decay function. y = (1/2)x

tangare [24]

Answer:

This would be a decay function.

Step-by-step explanation:

When a function is a growth function that means that it is growing but a decay function means that it is getting smaller.

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3 years ago