You are using a simulator to test the safety of ramp designs. You need to make sure that the drops aren't too steep. In the simulator, a skateboarder is riding along a curved ramp, which can be modeled by the function: f(x)=4/(x4)2+5 You need to calculate the average rate of change of the skateboarder's distance as they ride along the ramp from x=1 foot to x=2 feet