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3 years ago

Plz help me. I'll give Brainliest.

Mathematics

1 answer:

-BARSIC- [3]3 years ago

8 0

Answer:

I can't see the work ?????!!!

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Explain why rationalizing the denominator does not change the value of the original expression

anzhelika [568]

Rationalizing is just simpllifying, so the simplified value has the same value as the original expression.

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2 years ago

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R these correct? Miles per hour transferred to kilometers per hour, show ur work and explain, thanks

Arlecino [84]

They are correct (if rounded up)

Newberry park: 16.0934km

Thousand Oaks: 20.9215km

Los Angeles: 88.5139km

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3 years ago

A researcher would like to estimate p, the proportion of U.S. adults who support recognizing civil unions between gay or lesbian

Minchanka [31]

Answer:

Question 1:

(b) 4,445

Question 2:

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is of:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

Question 1:

We have no previous estimate for the population proportion, so we use $\pi = 0.5$ .

The sample size is n for which M = 0.015. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.015 = 1.96\sqrt{\frac{0.5*0.5}{n}}$

$0.015\sqrt{n} = 1.96*0.5$

$\sqrt{n} = \frac{1.96*0.5}{0.015}$

$(\sqrt{n})^2 = (\frac{1.96*0.5}{0.015})^2$

$n = 4268$

Samples above this value should be used, and the smaller sample above this value is of 4445, so the answer is given by option b.

Question 2:

Now we find M for which $n = 2222$ .

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$M = 1.96\sqrt{\frac{0.5*0.5}{2222}}$

$M = 0.021$

So 2.1%, and the correct answer is given by option c.

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2 years ago

What is the side length of a cube with a volume of 2197 cm3?

Nataliya [291]

The side length of a cube would be the cube root of its volume, because it's length, width and height are all the same. So the answer is 13

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2 years ago

Percentages

Kay [80]

People who said yes: $24-18=6$

Decimal: $\frac{6}{24} = \frac{6/6}{24/4} = \frac{1}{4} =0.25$

Percentage: $0.25*100=25$ --> 25%

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3 years ago

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