Congratulations on your last assignment :))
The period is 40 seconds, since it completes one revolution every 40 seconds.
The amplitude is 50 feet, since the distance between the lowest and highest points of the Ferris wheel is 100 feet.
The midline is 55 feet, since the center of the Ferris wheel is 55 feet above the ground.
Can you graph it from here?
=^._.^=