It has to do with maximum area. I need a break down and explanation of every step, because I try to do them and get them wrong every time:
A farmer has 90 feet of chain link fencing. He wants to enclose a rectangle and divide it into 4 dog runs. He puts one side of the rectangle along his barn so it needs no fencing. He puts 3 dividers parallel to the barn to make four dog runs. What dimensions should he make the rectangle to enclose the maximum total area?
A farmer has 90 feet of chain link fencing. He wants to enclose a rectangle and divide it into 4 dog runs. He puts one side of the rectangle along his barn so it needs no fencing. He puts 3 dividers parallel to the barn to make four dog runs. What dimensions should he make the rectangle to enclose the maximum total area?