Charlie builds sailboats for a shipyard. He builds various sizes of sailboats such that the speed of the sailboat (with the wind), f(x), in knots, largely depends on the length of the sail, x, in feet, and is twice the square root of its length. Dan also builds sailboats, but for another shipyard. The function gives the relationship between the speed of the sailboat, g(x), in knots, and length of the sail, x, in feet: .