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Use this graph to write an explicit function to represent the data and determine how much money Amy earned in week 5.
A. f(n) = 5(3)^n + 1; f(5) = 3,645
B. f(n) = 5(3)^n; f(5) = 1,215
C. f(n) = 5(3)^n - 1; f(5) = 405
D. f(n) = 3(3)^n - 1; f(5) = 81
