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3 years ago

9

Is it easier to subtract when the numbers are written above each other?

2 answers:

aksik [14]3 years ago

8 0

I would say yes, it is easier to subtract numbers when they are above and below each other because that ways you can easily borrow from the places in front of the number and rewrite without problems. It also helps keep the math more organized so that your work does not confuse you.

Hope this helps c:

Artemon [7]3 years ago

7 0

It is for some people. When they are above each other you just subtract down. For example if 52 minus 31 was above each other you would do 5 minus 3 and then 2 minus 1 and that would be your answer. I hope this helped!

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A researcher wants to estimate the percentage of all adults that have used the Internet to seek pre-purchase information in the

Lubov Fominskaja [6]

Answer:

The required sample size for the new study is 801.

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:

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

25% of all adults had used the Internet for such a purpose

This means that $\pi = 0.25$

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 $Z = 1.96$ .

What is the required sample size for the new study?

This is n for which M = 0.03. So

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

$0.03 = 1.96\sqrt{\frac{0.25*0.75)}{n}}$

$0.03\sqrt{n} = 1.96\sqrt{0.25*0.75}$

$\sqrt{n} = \frac{1.96\sqrt{0.25*0.75}}{0.03}$

$(\sqrt{n})^2 = (\frac{1.96\sqrt{0.25*0.75}}{0.03})^2$

$n = 800.3$

Rounding up:

The required sample size for the new study is 801.

4 0

3 years ago

28. What is the solution to 12-(2x+6) = -4x +10 +2(x-8) *

S_A_V [24]

Answer:

A-no solution

Step-by-step explanation:

There are no values of x that make the equation true.

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3 years ago

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mel-nik [20]

Answer:

7

Step-by-step explanation:

1, 1, 2, 4, 7, 8, 10, 15, 20

median = 7

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1 year ago

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Natasha2012 [34]

Answer:

4/7

Step-by-step explanation:

Tan= Opposite/Adjacent

Tan<f = 4/7

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3 years ago

5x-15=50 (Show your work)

Zigmanuir [339]

5x - 15 = 50
Add 15 to both sides
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3 years ago

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