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11Alexandr11 [23.1K]

2 years ago

11

What binomial must be subtracted from 7t-5) so that the difference of the 2 polynomials is (5r+8)?

1 answer:

Dima020 [189]2 years ago

5 0

1) Given binomials:

First binomial 7r - 5
Second binomial 5r + 8

2) To pass from 7r to 5r you have to subtract 2r, so the first term of the binomial to be subtracted is 2r

3) To pass form - 5 to + 8, you have fo subtract - 13

4) So the answer is 2r - 13, option b.

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We have the <u>standard deviation for the sample</u>, hence the t-distribution is used to build the confidence interval. Important information are given by:

Sample mean of $\overline{x} = 24$ .
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The confidence interval is:

$\overline{x} \pm t\frac{s}{\sqrt{n}}$

In which t is the critical value for a <u>95% confidence interval with 23 - 1 = 22 df</u>, thus, looking at a calculator or at the t-table, it is found that t = 2.0739.

Then:

$\overline{x} - t\frac{s}{\sqrt{n}} = 24 - 2.0739\frac{9}{\sqrt{23}} = 20.1$

$\overline{x} + t\frac{s}{\sqrt{n}} = 24 + 2.0739\frac{9}{\sqrt{23}} = 27.9$

The 95% confidence interval for the mean number of people the houses were shown is (20.1, 27.9).

A similar problem is given at brainly.com/question/15180581

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zlopas [31]

<u>Given </u>that the length of the hypotenuse is 8 and the angle is 42°

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