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Oxana [17]
3 years ago
8

Simplify the expression. 8(5k + 6m)

Mathematics
2 answers:
Zinaida [17]3 years ago
6 0

Answer:

40k+48m

have a good day :)

Ratling [72]3 years ago
6 0

Answer: 40 k  +  48 m

Step-by-step explanation:

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Which of the following estimates at a 95% confidence level most likely comes from a small sample?
dusya [7]
<span>The <u>correct answer</u> is:

A) 60% ± 18%.

Explanation:

In a confidence interval, the margin of error is given by z*(</span>σ/√n<span>), where </span>σ<span> is the standard deviation and n is the sample size.

First we <u>find the value of z</u>:

We want a 95% confidence level; 95% = 95/100 = 0.95.

To find the z-score, we first subtract this from 1:
1-0.95 = 0.05.

Divide by 2:
0.05/2 = 0.025.

Subtract from 1 again:
1-0.025 = 0.975.

Using a z-table, we find this value in the middle of the table. The z-score that is associated with this value is 1.96.

Back to our formula for margin of error, we have 1.96(</span>σ<span>/</span>√n<span>). The larger n, the sample size, is, the larger its square root is. When we divide by a larger number, our answer is smaller; this gives us a smaller margin of error.

This means that if we had a small sample size, we would divide by a smaller number, making our margin of error larger. The largest margin of error we have in this question is 18%, so this is our correct answer.</span>
7 0
3 years ago
box is filled with six yellow cards six red cards and three blue cards a card is chosen at random from the bag what is the proba
alexgriva [62]

Answer:

There is a 9/15 or 3/5

Step-by-step explanation:

There are a total of 15 cards, of those, 6 are red, so if you subtract 6 from 15, you get 9, which is the total amount of yellow and blue cards, which is what you were to not get a red card.

3 0
2 years ago
what is the y intercept of the line with a slope of - 4/7 that also passes through the point (7 , - 7/2) ?
kondor19780726 [428]

The answer is the last option: \frac{1}{2}

Explanation:

1. You have that the equation of the line is:

y=mx+b

Where m is the slope of the line and b is the intercept with the y-axis.

2. Therefore, you must find b.

3. Then, you must substitute the points given in the problem and the slope into the equation of the line and solve for b, as following:

y=mx+b\\-\frac{7}{2}=(-\frac{4}{7})(7)+b\\-\frac{7}{2}=-4+b\\b=\frac{1}{2}

8 0
3 years ago
HELP
Ira Lisetskai [31]

Answer:

166

Step-by-step explanation:

5/2=2.5

415/2.5

=166

8 0
3 years ago
A researcher is interested in estimating the difference in two population proportions. A sample of 400 from each population resu
sergey [27]

Answer: (-0.086, 0.026)

Step-by-step explanation:

The confidence interval for the difference of two population proportion is given by :-

p_1-p_2\pm\ z_{\alpha/2}\sqrt{\dfrac{p_1(1-p_1)}{n_1}+\dfrac{p_2(1-p_2)}{n_2}}

Given : Significance level : \alpha: 1-0.90=0.10

Critical value : z_{\alpha/2}=1.645

Sample size : n_1=400,\ n_2=400

p_1=0.61,\ p_2=0.64

The 90% confidence interval for the difference in the population proportions will be :-

0.61-0.64\pm\ (1.645)\sqrt{\dfrac{0.61(1-0.61)}{400}+\dfrac{0.64(1-0.64)}{400}}\\\\\approx-0.03\pm0.056=(-0.03-0.056,-0.03+0.056)\\\\=(-0.086, 0.026)

7 0
3 years ago
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