3 years ago

Which of these expressions represents the sum of two rational numbers being rational?

Mathematics

1 answer:

GaryK [48]3 years ago

3 0

Answer:

i think its number 2 hope its correct

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Suppose the population standard deviation is σ = 5 , an SRS of n = 100 is obtained, and the confidence level is chosen to be 98%

beks73 [17]

Answer:

1.165.

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:

$\alpha = \frac{1-0.98}{2} = 0.01$

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 $1-0.01 = 0.99$ , so $z = 2.33$

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 have that:

$\sigma = 5, n = 100$ . So

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

$M = 2.33*\frac{5}{\sqrt{100}} = 1.165$

So the correct answer is:

1.165.

6 0

4 years ago

The sum of two positive numbers is 5 times their difference. What is the ratio of the larger number to the smaller number?

Anna11 [10]

Let the two numbers be x and y

x + y = 5(x-y)
x + y = 5x -5y
6y = 4x
x= (6/4)y
x= (3/2)y

there the ratio is 3/2

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4 years ago

Find (f + g)(x). f(x) = -3x + 2 g(x) = x3 a. x3- 3x + 2 c. x3 + 3x -2 b. -x3- 3x +2 d. x3 Please select the best answer from the

Shkiper50 [21]

(f+g)(x) = -3x +2 + x³
Answer: A

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3 years ago

chuck earned $76 mowing lawns.the gas for the mower cost $12 and he bought a new string for the trimmer for $7.write and find th

Harlamova29_29 [7]

76 - 12 = 64 - 7 = 57

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3 years ago

Need help answering

adelina 88 [10]

I think the answer is 11

4 0

3 years ago

Read 2 more answers