In 2000,the population of Arizona was 5 million and growing continuously at a rate of 3.1% per year. Write a function f that models Arizona's population in millions x years after 2000.

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  1. F(x) = Po + Po*r*x,
    Factor out Po:
    F(x) = Po(1 + r*x),
    F(x) = 5(1 + 0.031x)

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