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3 years ago

7

which one the following is example of kinetic energy A) a compressed spring B) water that has been released through spillway C)

molecules at temperature below absolute zero D) a battery

1 answer:

irina1246 [14]3 years ago

6 0

The answer is D) a battery

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The federal government would like to estimate the proportion of households in the U.S. population that own their own homes. A pi

netineya [11]

Answer:

1770

Step-by-step explanation:

We need to estimate number of households to be sampled to construct a 99% confidence interval.

Number of households to be sampled=n=?

$n=\frac{(z_{\frac{\alpha}{2} })^2 pq }{E^{2} }$

$z_{\frac{\alpha}{2} } =z_{\frac{\0.01}{2} }=z_{0.005 }=2.576$

The proportion can be estimated as

p=x/n.

We know that 24 out of 40 households owns their home.

so, x=24 and n=40.

p=24/40

p=0.6

q=1-p=1-0.6=0.4

pq=0.6*0.4=0.24

E=0.03

$n=\frac{(z_{\frac{\alpha}{2} })^2 pq }{E^{2} }$

$n=\frac{2.576^2(0.24)}{0.03^2}$

$n=\frac{1.5926}{0.0009}$

n=1769.56.

n=1770.

Thus, the number of households that need to be sampled are 1770.

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3 years ago

During a sale at a bookstore, Joseph buys a book at full price. He is given a 50 percent discount on a second book of equal or l

Stolb23 [73]

So you will ad $15+$10 witch you will get $25 then you will divided by 50 and you will get $15.2 i hope this helps:)

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3 years ago

The face of the rubics cube is 22.2 centimeters. what is the length of the edge of the rubics cube?

slava [35]

Answer:

divide 22.2 by 4 since the perimeter is the outside and there are 4 edges

and you well get 5.55

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3 years ago

A car left at 09:45.the journey took 25 minutes. Work out when it arrive

ruslelena [56]

Answer:

The car arrived at 10:10

Step-by-step explanation:

1. Break up the time the journal took to make it easier

9:45 + 15 minutes = 10:00

10:00 + 10 minutes = 10:10

2. Check your answer

10 + 15 = 25 minutes total

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$\displaystyle\\6$

.

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3 years ago

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