6. A bungee jumper dives from a tower at time t = 0. Her height h (measured in feet) at time t (in seconds) is given by the graph in Figure 1.1.4. In this problem, you may base your answers on estimates from the graph or use the fact that the jumper's height function is given by s(t) = 100cos(0. 75t).e + 100. 200 150 100 50 5 10 15 20 Figure 1.1.4. A bungee jumper's height function. a. What is the change in vertical position of the bungee jumper between t = 0 and t = 15 ? b. Estimate the jumper's average velocity on each of the following time intervals: [0, 15], [0, 2], [1, 6], and [8, 10]. Include units on your answers. c. Estimate the jumper's instantaneous velocity at t = 5