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Soloha48 [4]
3 years ago
15

Order of Operations

Mathematics
2 answers:
Rufina [12.5K]3 years ago
8 0

9 - (a - 7)

Note that - = -1

First, distribute - 1 to all terms within the parenthesis

-1(a - 7) = -a + 7

9 - a + 7

Combine like terms

9 + 7 = 16

-a + 16, or A. 16 - a is your answer

hope this helps

RideAnS [48]3 years ago
8 0

9 - (a - 7)

a = -1

9 + 7 = 16

The correct answer is A. 16 - a

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A pentagonal prism has a height of 9 feet, and each base edge is 3 feet. Find the volume. Round your answer to the nearest hundr
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Height of the pentagon = 9 ft

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area of pentagon = \frac{s^{2}n}{4 tan\left ( \frac{180}{n} \right )}

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tan is the tangent function calculated in degrees

\\ \\\\area of pentagon = \frac{3^{2}(5)}{4 tan\left ( \frac{180}{5} \right )}\\\\\\area of pentagon = \frac{9(5)}{4 tan\left ( 36 \right )}\\\\area of pentagon = \frac{45}{4  ( 0.7265 )}\\\\area of pentagon = \frac{45}{2.906}\\\\area of pentagon = 15.4852

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Volume of the pentagon = 15.4852 (9)

Volume of the pentagon = 139.366

Volume of the pentagon = 139.37 cu.ft


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