Book Maths Puzzle Area and Volume

Area of a trapezoid is 24
base 1 = 8
base 2 = same as height,
what is the height??

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Book Other Question

Hi, I am trying to solve this Linear Equation System by using the substitution method:

-x+3y=-1
x-2y=6 Solve

1. (x^3 + 5x^2 + 2x - 8) / (x - 1)

2. (y^3 - 19y - 30) / (y + 2)

3. (t^4 + 10t^3 + 35t^2 + 50t + 24) / (t^2 + 7t + 12)