A zoo needs to build a rectangular enclosure that is made up of a 15 foot brick retaining wall on one side and a 10 foot chain link fence topping a two foot high brick wall on the other three sides. The brick retaining wall costs $307
dollars per foot and the chain link / brick fence costs about $68
per foot. What dimensions will minimize the cost to build an enclosure that holds an area of
2000 square feet?
