Answer:
Simplifying
8x + 17 = 137
Reorder the terms:
17 + 8x = 137
Solving
17 + 8x = 137
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-17' to each side of the equation.
17 + -17 + 8x = 137 + -17
Combine like terms: 17 + -17 = 0
0 + 8x = 137 + -17
8x = 137 + -17
Combine like terms: 137 + -17 = 120
8x = 120
Divide each side by '8'.
x = 15
Simplifying
x = 15
maybe try -5 since the rise/run is 5/1 and the slope is negative
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Volume is area of the triangle multiplied by length:
area = 1/2*base*height
= 1/2*7*2
=7
therefore V = 7*18
= 126

Alternatively, you can write radicals as rational exponents, so that you get

Then recalling that

, you have