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alto = x
ancho = x-4
(x)(x+9)(x-4)=180
x(x²+5x-36)=180
x³+5x²-36x-180=0
factoreo por evaluacion te queda
(x²-36)(x+5)=0
x1=6
x2=-6
x3=-5
tomando solo el positivo
x=6
por tanto
largo = 15pies
ancho = 2 pies
alto = 6 pies