the height, in feet, of Ferris wheel rider t seconds after the ride begins is given by h(t)=-35cos(2t)+45. What is the average rate of change of height, in feet per second, from time t=30 to t=45? (radians)

the height in feet of Ferris wheel rider t seconds after the ride begins is given by ht35cos2t45 What is the average rate of change of height in feet per second class=