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3 years ago

4(x+7)=38 what is x and explain please

Mathematics

2 answers:

KIM [24]3 years ago

5 0

The answer is 2.5.

blagie [28]3 years ago

3 0

4(x+7)=38
4x + 28 = 38 - distribute the 4 into x and 7
4x = 10 - subtract 28 from both sides
x = 2.5 - divide both sides by 4 to get x by itself

answer - x = 2.5

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Step-by-step explanation:

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3 years ago

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iragen [17]

Answer:

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3 years ago

I paid $42 for six hot chocolate bombs what is the unit rate price for one item

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Step-by-step explanation:

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2 years ago

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Mashutka [201]

Answer:

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4 0

2 years ago

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Slav-nsk [51]

Answer:

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$\hat{CV} =\frac{18.68}{127.5}=0.147$

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$\hat{CV} =\frac{12.65}{74.2}=0.170$

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Step-by-step explanation:

Assuming the following data:

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117; 80

126; 77

158; 76

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157; 90

122; 89

116; 60

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The coefficient of variation is defined as " a statistical measure of the dispersion of data points in a data series around the mean" and is defined as:

$CV= \frac{\sigma}{\mu}$

And the best estimator is $\hat {CV} =\frac{s}{\bar x}$

Systolic on right

We can calculate the mean and deviation with the following formulas:

[te]\bar x = \frac{\sum_{i=1}^n X_i}{n}[/tex]

$s= \frac{\sum_{i=1}^n (x_i -\bar X)^2}{n-1}$

For this case we have the following values:

$\bar x = 127.5, s= 18.68$

So then the coeffcient of variation is given by:

$\hat{CV} =\frac{18.68}{127.5}=0.147$

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For this case we have the following values:

$\bar x = 74.2 s= 12.65$

So then the coeffcient of variation is given by:

$\hat{CV} =\frac{12.65}{74.2}=0.170$

So for this case we have more variation for the data of systolic on left compared to the data systolic on right but the difference is not big since 0.170-0.147 = 0.023.

4 0

2 years ago