question is complete.

Graham wants to take snowboarding lessons at a nearby ski resort that charges $40 per week for a class that meets once during the week for 1 hour and gives him a lift ticket valid for 4 hours. The resort also charges a one-time equipment-rental fee of $99 for uninterrupted enrollment in classes. The resort requires that learners pay for three weeks of classes at a time. a. Write a model that gives Graham's average weekly enrollment cost (in dollars) as a function of the time (in weeks) that Graham takes classes. b. How much would Graham's average weekly enrollment cost be if he took classes only for the minimum of three weeks? c. For how many weeks would Graham need to take classes for his average weekly enrollment cost to be at most $60? Describe how you can use a graphing calculator to graph the function from part a in order to answer this question, and then state the