36. Weight Loss Courtney tried several different diets over a two-year period in an attempt to lose weight. She found that her weight W followed a fluctuating curve that could be modeled by the function W=220−1.5t+9.81sin(πt/4), where t was measured in months after January 1 of the first year and W was measured in pounds.
(a) What was Courtney's weight at the start and at the end of two years?
(b) What was her maximum weight during the two-year period?
(c) What was her minimum weight during the two-year period?