2. 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.