Joan has $ 60 to buy her friends a gift bag. The gift bags are $ 4 each. The function f ( x ) = − 4 x + 60 represents the amount of money Joan has left in her budget after purchasing x number of gift bags. Complete the statements. The solution for f ( x ) = 72 is x = [DROP DOWN 1] which [DROP DOWN 2] a viable solution in this scenario.

DROP DOWN 1
-3
-15
3
15

DROP DOWN 2
is
is not