Help me with this! i am confused!!

73.5

Step-by-step explanation:

The shaded area is in the shape of a trapezoid, so to find the area all we have to do is use the formula

, where h is height, a is base 1, and b is base 2.

Plugging in the values, work on solving this equation:

---------------Math Skip---------------------

We should be left with

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x