Final answer:
The easiest function to use to model the height of a rider on a Ferris wheel as a function of time would be the sine function unreflected.
Step-by-step explanation:
The easiest function to use to model the height of a rider on a Ferris wheel as a function of time would be the sine function unreflected. When the rider is at the bottom of the Ferris wheel at t = 0 minutes, the height of the rider can be represented by a sine function that starts at 0 and increases as time passes.