Math
posted by Anonymous .
A dog kennel owner needs to build a dog run (rectangular area) adjacent to a kennel cage (so that it is in the shape of a rectangle, but only three sides need to be built one long side is already there). The short side walls of the run are to be cinder block (costs $0.50 per square foot) and the outer walls are to be chain link fence ($2.75 per square foot). Local regulations require the walls to be at least seven feet high and the are to measure no fewer than 120 square feet.
Any help would be greatly appericiated! I can't seem to find an equation with only one variable.

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