Frank and Gertrude mow lawns for extra money over the summer. Frank's income is determined by f(x) = 5x + 15, where x is the number of hours. Gertrude's income is g(x) = 4x + 20. If Frank and Gertrude were to combine their efforts, their income would be h(x) = f(x) + g(x). Create the new function h(x). If Frank works 4 hours and Gertrude works 4 hours, and if they each get half of the money when they work together, will Frank make more money working alone or by teaming with Gertrude?