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3 years ago

Please help me thank you in advance!

Mathematics

1 answer:

Oxana [17]3 years ago

7 0

Answer:

First option: (x+9)^2=81

Step-by-step explanation:

It has the same solution

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A Gallup Poll showed that 30% of Americans are satisfied with the way things are going in the United States. Suppose a sample of

mars1129 [50]

The expected number of a distribution is its mean.

The expected number of Americans who are satisfied with the way things are going in the United States is 6
The standard deviation of Americans who are satisfied with the way things are going in the United States is 2.05

The given parameters are:

$\mathbf{p = 30\%}$ --- the proportion that are satisfied

$\mathbf{n = 20}$ --- the sample size

(a) The expected number that are satisfied

This is calculated using:

$\mathbf{E(x) = np}$

So, we have:

$\mathbf{E(x) = 20 \times 30\%}$

$\mathbf{E(x) = 6}$

The expected number of Americans who are satisfied with the way things are going in the United States is 6

(b) The standard deviation of those that are satisfied

This is calculated using:

$\mathbf{\sigma = \sqrt{n \times p \times (1 - p)}}$

So, we have:

$\mathbf{\sigma = \sqrt{20 \times 30\% \times (1 - 30\%)}}$

$\mathbf{\sigma = \sqrt{20 \times 30\% \times 70\%}}$

$\mathbf{\sigma = \sqrt{4.2}}$

$\mathbf{\sigma = 2.05}$

The standard deviation of Americans who are satisfied with the way things are going in the United States is 2.05

Read more about expected value and standard deviations at:

brainly.com/question/17088771

4 0

3 years ago

What is 547 divided by 8 work it out

spin [16.1K]

Answer:68.375

Step-by-step explanation:

547/8

8 can go into 54. 6 times

8*6=48

54-48=6

Bring down the 7

8 can go into 67 8 times

8*8 is 64

67-64 is 3 so the remainder is 3

The .375 is when you put a decimal than add 0

3 0

3 years ago

Give an example of a rational number that is a whole number. Show that the number is both whole and rational

DiKsa [7]

Answer:

Step-by-step explanation:

6 0

4 years ago

Choose what the expressions below best represent within the context of the word problem. If Sarah is 24 years younger than her m

KIM [24]

Hello Kiddo.

This question is a bit confusing to me, but I think I grasped the concept.
1. x best represents Sarah's mom's age.
2. x - 24 best represents Sarah's mom's age minus how much younger Sarah is than her mom.
3. The expression would look a little like this:
2x-24 = 68
+ 24 +24
2x = 92
/2 /2
x = 46.

Which means, Sarah is 22 and her mom is 46 years of age.
If you need more clarification, I'd be more than happy to elaborate further.

5 0

3 years ago

Read 2 more answers

Can someone help me please click the picture ?

klasskru [66]

Answer: c
Reflection across the y axis

7 0

3 years ago