Kahleela starts the engine on her small private airplane. the engine drives a propeller with a radius of 8.5 feet and its centerline 11.5 feet above the ground. at idle, the propeller rotates at a constant speed of approximately 800 revolutions per minute. the height of one propeller tip as a function of time is given by h = 11.5 + 8.5 sin(800t), where h is the height in feet and t is the time in minutes. find h when t = 5.5 minutes. a. 3.1 ft b. 13 ft c. 19.9 ft d. 10 ft