You and your friend join a new yoga studio that requires a one-time joining fee and monthly payments. (4.5 pts)

1. If your friend stays with this studio for 15 months and pays $645 while you stay for 24 months and pay $852, formulate a linear function that describes the cost of studio membership, C, in terms of the number of months, m. (2.5 pts)
2. What is the cost per month and what is the joining fee? (1 pt)
3. Determine the maximum number of months one can stay with this gym for $1500. (1pt)