Sara is riding a ferris wheel. her sister kari starts a stopwatch and records some data. let h represent sara's height above the ground at time t. kari noticed that sara is at the highest point. 80 feet above the ground. when t=3 seconds. when t=7 seconds sara is at the lowest point. 20 feet above the ground. assume that the height varies sinusoidally with time. write a trigonometric equation for the height of sara above the ground as a function of time. what will sara, s height be at t=11.5 seconds? determine the first two times, t> 0 when sara's height is 70 feet.