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MrMuchimi
2 years ago
13

A $78.00 pair of shoes cost $84.63 after tax is added. What

Mathematics
1 answer:
Evgen [1.6K]2 years ago
8 0
6.63 is the answer barbz
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Beyonce is solving a system of equations: 2x – 3y = -2
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Step-by-step explanation:

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2 years ago
Two angles are supplementary. One is 56° more than three times three times the other. Find the measures of the angles.
kaheart [24]
Supplementary means they equal 180 when added. Therefore:

X+56+3x=180
Combine common units
4x+56=180
Subtract 56 from both sides
4x=124
Divide by 4
X=31

Now we know the smaller angle is 31 degrees. Now we plug that into the larger angle:
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The larger angle is 149 degrees.

I hope this Helps!
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2 years ago
Find the measure of angle 1
quester [9]

Answer:

120 degrees

Step-by-step explanation:

You can just eyeball that it is greater than 90 degreees so it must be 120 degrees.

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2 years ago
If 14 g of a radioactive substance are present initially and 3 yr later only 7 g​ remain, how much of the substance will be pres
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5 0
2 years ago
If you want to be 95​% confident of estimating the population mean to within a sampling error of plus or minus3 and the standard
Aleksandr [31]

Answer:

The sample size required is at least 171

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{1-0.95}{2} = 0.025

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 1-0.025 = 0.975, so z = 1.96

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.

What sample size is​ required?

A samle size of at least n is required, in which n is found when M = 3, \sigma = 20

So

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

3 = 1.96*\frac{20}{\sqrt{n}}

3\sqrt{n} = 20*1.96

\sqrt{n} = \frac{20*1.96}{3}

(\sqrt{n})^{2} = (\frac{20*1.96}{3})^{2}

n = 170.7

Rouding up

The sample size required is at least 171

5 0
2 years ago
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