3. consider the iterative rules you wrote in problem 2.

(a) explain why the rules are functions.

(b) your friend says that because the rules are functions, they can be graphed and must have y-intercepts.
how would you respond to your friend’s comment?

(c) your friend uses your rules to determine the outputs when the inputs are 18.5.
explain why her outputs are meaningless in this situation. what would you tell her about the inputs she can use?