114 ÷ 19<br><img src="https://tex.z-dn.net/?f=114%20%5Cdiv%2019%20%3D" id="TexFormula1" title="114 \div 19 =" alt="114 \div 19 =

Hector drew a 120 angle. What fraction of a circle does hector's angle turn through. PLSSSS HELP

disa [49]

Answer:

please send a picture so I can see

3 0

2 years ago

20 POINTS , ALSO GIVING BRAINLIEST , PLEASE HURRY !!

liq [111]

Answer:

.5236

Step-by-step explanation:

Formula for sphere volume:

V = $\frac{4}{3} \pi r^{3}$

substiture 0.5 for r:

$\frac{4}{3} \pi 0.5^{3}$ = .5236

5 0

2 years ago

An equation with an exponent is called an exponential equation. True False

lyudmila [28]

Answer:

true

Step-by-step explanation:

7 0

2 years ago

<img src="https://tex.z-dn.net/?f=%5Csqrt288x4y9" id="TexFormula1" title="\sqrt288x4y9" alt="\sqrt288x4y9" align="absmiddle" cla

sasho [114]

Here's what I got, hope it helps.

5 0

2 years ago

It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken if the desir

Ksju [112]

Answer:

We need a sample size of at least 75.

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:

$\alpha = \frac{1-0.95}{2} = 0.025$

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 $1-0.025 = 0.975$ , so $z = 1.96$

Now, we 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.

The standard deviation is the square root of the variance. So:

$\sigma = \sqrt{484} = 22$

With a .95 probability, the sample size that needs to be taken if the desired margin of error is 5 or less is

We need a sample size of at least n, in which n is found when M = 5. So

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

$5 = 1.96*\frac{22}{\sqrt{n}}$

$5\sqrt{n} = 43.12$

$\sqrt{n} = \frac{43.12}{5}$

$\sqrt{n} = 8.624$

$(\sqrt{n})^{2} = (8.624)^{2}$

$n = 74.4$

We need a sample size of at least 75.

6 0

3 years ago

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