A local gym offers a membership plan where the total monthly cost, , in dollars, is given by the equation , where is the number of hours a member spends with a personal trainer during that month. Which of the following is the best interpretation of the number 25 in this context?
The hourly rate for a personal trainer
The maximum number of hours a member can spend with a personal trainer
The base monthly membership fee, regardless of trainer use
The total cost for 25 hours of personal training
