Hi, can someone help. A ferris wheel has a diameter of 40ft and its axle is 25 ft above the ground. Three seconds after it starts, your seat is at a high point. The wheel makes 3 rev/min. I know that the equation is 25 + 20cos(pi/10)(t-3). What is the fastest that the function changes? Where is the seat when the function changest the fastest? Please explain the last 2 questions.