13) 5 points For a motorcycle traveling at speed v (inmph) when the brakes are applied, the distance d (in feet) required to stop the motorcycle may be approximated by the formula d = 0.05 v2 + v. Find the instantaneous rate of change of distance with respect to velocity when the speed is 48 mph 14) 6 points If the profit function is P(x) =+ -+ 2x - 10 for producing a product, find the marginal profit at a production level of 10 units. Express the answer as a simplified fraction