Answer: I changed 2 items ({2} and ix), so review carefully. The length is (x-70) feet.
Step-by-step explanation:
Area = x^2 - 110x+2800
Width = (x-40)
Area = Width x Length
(x^2 - 110x+2800) = (x-40)*L
L = (x^2 - 110x+2800)/(x-40)
L = (x - 40)(x-70)/(x-40) Factor the numerator.
L = (x - 70) feet
