Final answer:
The recursive function that models population growth can be written as pt+1 = pt * (1 + 0.06).
Step-by-step explanation:
The recursive function that models population growth can be written as pt+1 = pt * (1 + 0.06), where pt is the current population, 0.06 is the growth rate (6% per year), and t is the number of years.
So, option c) pt+1 = pt * (1 + 0.06) is the correct answer.