Aging population the population in millions of developed

Question

Question: AGING POPULATION The population (in millions) of developed countries from 2005 through 2034 is projected to be

f(t) = 3.567t + 175.2        (5 ≤ t ≤ 35)

where t is measured in years. On the other hand, the population of underdeveloped/emerging countries over the same period is projected to be

g(t) = 0.46t² + 0.16t + 287.8          (5 ≤ t ≤ 35)

a. What does the function D t + f represent?

b. Find D' and D'(10) and interpret your results.