The expression below shows the population of butterflies in a forest after 4x years: f(x) = 40(1.04)^4x Which of the following is an equivalent function? f(x) = 40(4.1600)^x f(x) = 480(1.04)^x f(x) = 40(1.1699)^x f(x) = 480(4.1600)^x