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Black_prince [1.1K]
2 years ago
8

The figures are similar. Find x. Brainiest to the correct person!

Mathematics
2 answers:
kolbaska11 [484]2 years ago
7 0

Answer:

x= 6 and 2/3 or 6.6 repeating.

Step-by-step explanation:

9/4 is 2.25 then we take 15 and divide it by 2.25 in order to get 6.6 repeating and that should be the answer.

ad-work [718]2 years ago
4 0
Its 10 if its scaled down.

9-4 is 5 so it went down 5
15-5 is 10.
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Sam, Jessie, and Emma go out for burgers. The total cost is $21.39. How much will each person pay if they split the cost equally
Nadusha1986 [10]

Answer:

$7.13

Step-by-step explanation:

There is 3 people and they need to SPLIT the cost. Split means divide in this situation. So, divide 21.39 by 3 and you should get 7.13.

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2 years ago
An equation is shown below:
gayaneshka [121]
6(2x-11)+15=3x+12 Given
12x-66+15=3x+12 Distribution
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12x=3x+63 addition
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x=7 division

the value of x that makes the equation true is 7.

8 0
2 years ago
Simplify the expression 7.8n²+0.5+9n-.0.4-7n+n²​
Natali [406]

The final answer for this question would be.....

8.8n^2+16n+0.1

Hope this helps!!!!

4 0
3 years ago
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Leslie bought an
Evgen [1.6K]

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2 years ago
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A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. The number of subjects needed to estima
Ludmilka [50]

Answer:

n=(\frac{1.64(14.7)}{3})^2 =64.57 \approx 65

So the answer for this case would be n=65 rounded up to the nearest integer

And the sample size would decrease by 160-65=95 subjects

Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size  

ME represent the margin of error

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

2) Solution to the problem

Since the new Confidence is 0.90 or 90%, the value of \alpha=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.05,0,1)".And we see that z_{\alpha/2}=1.64

Assuming that the deviation is known we can express the margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (a)

And on this case we have that ME =\pm 3 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=(\frac{z_{\alpha/2} \sigma}{ME})^2   (b)

Replacing into formula (b) we got:

n=(\frac{1.64(14.7)}{3})^2 =64.57 \approx 65

So the answer for this case would be n=65 rounded up to the nearest integer

And the sample size would decrease by 160-65=95 subjects

8 0
3 years ago
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