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Alenkasestr [34]
3 years ago
7

Simplify 3(x+4) A.3(x+4) B.7x C.12x D.3X+12

Mathematics
2 answers:
N76 [4]3 years ago
8 0

Answer:

D. 3x + 12

Step-by-step explanation:

Distribute the 3 inside.

3 * x = 3x

3 * 4 = 12

3x + 12

melisa1 [442]3 years ago
6 0

Answer:

3x+12 (D)

Step-by-step explanation:

3(x+4)

=(3)(x+4)

=(3)(x)+(3)(4)

=3x+12

Hope this helps!

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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

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\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

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The answer to the question

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