Answer:
Explanation:
Width=4 inches
Height= 20 inches
A = 1/2bh
40 = (.5)(6x - 4)(x)
40 = (3x-2)(x)
40= 3x^2 - 2x
3x^2 -2x - 40 =0
3x^2 - 12x + 10x - 40 = 0
3x(x - 4) + 10(x -4) = 0
(3x + 10)(x - 4) = 0
x = {4 , - 10/3}
x = 4 , b = 20. h = 4
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