Whitney starts the engine on her small private airplane. the engine drives a propeller with a radius of 6.5 feet and its centerline 10.5 feet above the ground. at idle, the propeller rotates at a constant speed of approximately 850 revolutions per minute. the height of one propeller tip as a function of time is given by h = 10.5 + 6.5 sin(850t), where h is the height in feet and t is the time in minutes. find h when t = 2 minutes a. 4.1 ft b. 9.4 ft c. 16.9 ft d. 11.6 ft