Quadratic Word Problem

Rufus Leaking dives off the high diving board. His distance from the surface of the water varies quadratically with the number of seconds that have passed since he left the board. His distances at times of 1, 2, and 3 seconds since he left the board are 24, 18, and 2 meters above the water, respectively.

a) Define the variables, what are the three ordered pairs, and write the particular equation for this function.