Tom's brother saw an advertisement for a special at Muscle Fitness. Muscle Fitness is offering $20 off the one-time regular registration fee of $80. Membership is $15 per month with a mandatory additional $5 charge per month for equipment maintenance. Tom's brother tells Tom that he feels it is a better deal than Platinum Gym.
(a) Write an expression to represent the membership cost of Muscle Fitness for x months.
(b) Is Tom's brother right? Explain why or why not.