Respuesta :

Answer:

Length in feet = X - 80

Step-by-step explanation:

A = width x length

A/width = length

(x^2 -100x + 1600) /( x - 20) = length

(x - 20) (x - 80) / (x - 20) = length

x - 80 = length

x - 80 = length

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