Demographics—City Population: The population of Granaco City can be modeled by
f(x) = 64,000e0.04x 0 ≤ x ≤ 20
where x represents the number of years since 1980 and f(x) represents the number of people living in Granaco City.
(a) Evaluate f(4) and interpret.
(b) Find the slope of the secant line for x = 5 and Δx = 3 and interpret.
(c) In what year did the population first exceed 110,000?
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