AlgebraEasyCost function for a gym membership
Algebra practice question
A gym charges 20 dollars to join and 15 dollars for each month of membership. Which function gives the total cost C, in dollars, after m months?
- A. C = 15m + 20Correct
- B. C = 20m + 15
- C. C = 35m
- D. C = 15m − 20
Answer: A. C = 15m + 20
The monthly charge multiplies m, and the one-time joining fee is the constant.
Why the other answers are wrong
- B. C = 20m + 15
- This swaps the monthly charge and the joining fee.
- C. C = 35m
- This charges the joining fee every month.
- D. C = 15m − 20
- This subtracts the joining fee instead of adding it.
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