Question: CHILD OBESITY The percentage of obese children, ages 12-19, in the United States has grown dramatically in recent years. The percentage of obese children from 1980 through the year 2000 is approximated by the function
P(t) = -0.0105t2 + 0.735t + 5 (0 ≤ t ≤ 20)
where t is measured in years, with t = 0 corresponding to the beginning of 1980.
a. What percentage of children were obese at the beginning of 1980? At the beginning of 1990 ? At the beginning of the year 2000 ?
b. How fast was the percentage of obese children changing at the beginning of 1985? At the beginning of 1990?