Extensive testing of an experimental 2820-lb automobile reveals the aerodynamic drag force FD and the total no aerodynamic rolling-resistance force FR to be as shown in the plot. Determine (a) the power required for steady speeds of 22 and 44 mi/hr on a level road, (b) the power required for a steady speed of 44 mi/hr both up and down a 5-percent incline, and (c) the steady speed at which no power is required going down the 5-percent incline.