could u do 15 pls

14. Justine starts 6 km from home. She rides her bicycle and arrives home 25 min later. Determine the average rate of change, in kilometres per hour, of her distance from home during the ride. Rates of Change for Polynomial Functions 15. The height, b, in metres, of a baseball as it flies through the air can be modelled by the function b = 20t - 5to, where t is the time, in seconds. a) Determine the average rate of change of the height from t = 0.1 s to t = 0.5 s. b) Estimate the instantaneous rate of change of the height at t = 0.5 s. c) What quantity is represented by the instantaneous rate of change in part b)