Solve.
13. The total number of dollars donated each year to a small charitable organization
has followed the trend d(t) = 2t³ +10t² + 2000t + 10,000, where d is dollars and t
is the number of years since 1990. The total number of donors each year has
followed the trend p(t)=t² +1000. Write an expression describing the average
number of dollars per donor.