A farmer wants to fence in a rectangular field with one side along a rock wall. he has a total of 650 feet of fencing to use. The side along the wall does not need to be fenced in. Which of the follow

A farmer wants to fence in a rectangular field with one side along a rock wall. he has a total of 650 feet of fencing to use. The side along the wall does not need to be fenced in. Which of the following formulas represents the area A of the field as a function of x