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4 years ago

What is the square root of -1

Mathematics

2 answers:

Rina8888 [55]4 years ago

5 0

Answer:

-1

Step-by-step explanation:

tangare [24]4 years ago

5 0

Answer:

1 My dearest friend :D :)

Step-by-step explanation:

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What’s the meaning of pi and how to find the volume of a cylinder. Only do number 1 !!

Triss [41]

Answer:

to find volume of cylinder use formula=

$\pi {rh}^{2}$

and

$\pi = 22 \div 7 \: or \: 3.14$

3 0

3 years ago

Determine the minimum sample size required when you want to be 99% confident that the sample mean is within 0.50 units of the po

vfiekz [6]

Answer:

b. 224

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:

$\alpha = \frac{1-0.99}{2} = 0.005$

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 $1-0.005 = 0.995$ , so $z = 2.58$

Now, 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.

In this problem:

We want to find n, when $M = 0.5, \sigma = 2.9$ So

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

$0.5 = 2.58*\frac{2.9}{\sqrt{n}}$

$0.5\sqrt{n} = 7.482$

$\sqrt{n} = 14.964$

$(\sqrt{n})^{2} = (14.964)^{2}$

$n = 223.9$

The nearest integer number to 223.9 is 224.

So the correct answer is:

b. 224

6 0

3 years ago

Given AABE - AACD then solve for side AB,

Tpy6a [65]

Answer:

Step-by-step explanation:

Let the side of AB be x.

3/12=2/2+x

3x=18

x=6

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3 years ago

Each of the skiers above have the same weight of 100 pounds. Which skier (yellow or blue) has the greatest gravitational potenti

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Answer:

The highest.

Step-by-step explanation:

I'm assuming there is supposed to be a picture but the skier highest on the mountain will have the greatest gravitational potential energy.

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3 years ago

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vovikov84 [41]

Answer:

Did you ever figure this out?

Step-by-step explanation:

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4 years ago