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2 years ago

HELP ME PLEASE!!!!!! ASAP!!!!!!!

Mathematics

1 answer:

Misha Larkins [42]2 years ago

7 0

Answer:

your answer is C

Step-by-step explanation:

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Inverse cosine of square root of 3 over 2? cos-1(square root of 3/2)

Amiraneli [1.4K]

Cos(x°) = (√3)/2
cos⁻¹[(√3)/2] = x°, that means x° = 30°

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2 years ago

14) Simplify: -2x(3 - 5x)

harina [27]

Answer:

-6x +10x= 4x

Step-by-step explanation:

-2x(3 - 5x)

-6x +10x= 4x

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2 years ago

A population has a standard deviation of 5.5. What is the standard error of the sampling distribution if the sample size is 81?

VladimirAG [237]

Answer:

$\sigma = 5.5$

And we have a sample size of n =81. We want to estimate the standard error of the sampling distribution $\bar X$ and for this case we know that the distribution is given by:

$\bar X \sim N(\mu ,\frac{\sigma}{\sqrt{n}})$

And the standard error would be:

$\sigma_{\bar x}= \frac{\sigma}{\sqrt{n}}$

And replacing we got:

$\sigma_{\bar x}=\frac{5.5}{\sqrt{81}}= 0.611$

Step-by-step explanation:

For this case we know the population deviation given by:

$\sigma = 5.5$

And we have a sample size of n =81. We want to estimate the standard error of the sampling distribution $\bar X$ and for this case we know that the distribution is given by:

$\bar X \sim N(\mu ,\frac{\sigma}{\sqrt{n}})$

And the standard error would be:

$\sigma_{\bar x}= \frac{\sigma}{\sqrt{n}}$

And replacing we got:

$\sigma_{\bar x}=\frac{5.5}{\sqrt{81}}= 0.611$

4 0

2 years ago

Sarah spends of her monthly take-home pay on rent, food, and clothing. If she earns $1,830 in take-home pay each month, how much

frosja888 [35]

Sarah spendings

We have that Sarah spends 2/3 of $1,830 in rent food and clothing

In order to find the money she spends, we just have to divide $1,830 in 3 and multiply the result by 2:

$\begin{gathered} \frac{1830}{3}=610 \\ 610\cdot2=1220 \end{gathered}$ <h2>Answer - D. $1,220</h2>

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8 months ago

A. Is this an arithmetic sequence? How do you know?

pogonyaev

Answer:

a. Yes. The difference is common and equal to $1750

b. $1750

c. $20000 was initial investment

d. This is linear equation with start point of 20000 and slope of 1750:

y = 1750x + 20000

e. After another 10 years (on the top of 5 given) the investment will be:

y = 1750*15 + 20000 = $46250

f. After 20 years the value of investment will be:

y = 1750*20 + 20000 = $55000

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2 years ago