I really need help on this problem.

b. Find the first 3. A pendulum hangs from a ceiling and swings back and forth towards a wall. Harry starts timing and at t = 4 seconds when the pendulum is closest to the wall, 25 cm away. Three seconds later the pendulum is farthest from the wall, 83 cm away. Find an equation for the distance the pendulum is from the wall at any time t. a. Find out how far the pendulum is away from the wall at t = 8 seconds. b. Find the first time when the pendulum is 33 cm away from the wall