Definition One: f(1) = 64 and f(n) = f(n - 1) for n 2 Definition Two: f(n) = 64. (1)1 for n 1. 1) List the first 4 terms of this sequence. 2) Write an expression to represent f(20). 3) A person is trying to quit chewing gum. They decide they will have 64 pieces in week 1, but each week have half as many as the week before. The function f represents the number of pieces of gum they will have in week n. What is a reasonable domain for this function? Explain your reasoning.