A rectangular area is to be enclosed and divided into thirds. The family has $640 to spend for the fencing material. The outside fence costs $10 per foot installed, and the dividers cost $20 per foot installed. Letx represent the length (in feet) of a side perpendicular to the dividers, and let y represent the length (in feet) of a side parallel to the dividers. Write an equation that represents the area of the enclosed rectangle in terms of the variable y. A(y) = X Find A\"(y). A"(Y) = X