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Explanation:
Area of trapezoid height x average of bases
area = (x+2) * ( 12-4x + 12)/2
= (x+2) (12-2x) = 12x -2x^2 +24 -4x
area = -2x^2 +8x+24 will be a maximum at x = - b/2a = -8/(2*-2) = 2
x=2
Max area = 32 ft^2
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