Alex buys a subscription to a streaming site. The function describes the 5.50m c=3+2 cost of the yearly subscription,c, in terms of the numb

Alex buys a subscription to a streaming site. The function describes the 5.50m c=3+2 cost of the yearly subscription,c, in terms of the number of months he uses the service. Would the set of integers be an appropriate domain for the function? What about the set of natural (or counting) numbers? The set of real numbers? Explain why or why not.