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4 years ago

What answer to 7(v+9)-8(5-7)

Mathematics

2 answers:

ratelena [41]4 years ago

8 0

Distribute 7 to (v + 9) using PEMDAS, and use PEMDAS to solve -8(5-7).

7(v + 9) = 7v + 63

(5 - 7) = -2(-8) = 16

7v + 63 + 16

Simplify. Combine like terms

7v + 79

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7v + 79 is your answer

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hope this helps

postnew [5]4 years ago

7 0

Hope this helps u...!!

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Step-by-step explanation:

Given

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Solving (a): The range

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The variance is calculated as:

$\sigma^2 =\frac{1}{n-1}\sum(x - \bar x)^2$

So, we have:

$\sigma^2 =\frac{1}{6-1}*[(136 - 135)^2 +(129 - 135)^2 +(141 - 135)^2 +(139 - 135)^2 +(138 - 135)^2 +(127 - 135)^2]$

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Solving (c): The standard deviation

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