Let b(t) be the number of births in the United States in year t, and let d(t)

Question:

Let b(t) be the number of births in the United States in year t, and let d(t) represent the number of deaths in the United States in year t, where t = 10 corresponds to 2010.
(a) If p(t) is the population of the United States in year t, find the function c(t) that represents the percent change in the population of the United States.
(b) Interpret c(16).