Problem: A farmer has 2400 feet of fencing and wants to fence off a rectangular field that borders a straight river. He needs no fence along the river. Write a formula for the area of the fenced field in terms of the length of the field along the river (L).
Problem 7: A farmer wants to fence an area of 15,000 square feet in a rectangular field, and then divide the field in half with a fence parallel to one side. Write a formula for the length of the fence in terms of the width of the field (w).