400
The equation C = 15 + 4t describes the cost of riding a horse at Happy Farms. In this equation, C represents the total cost (in dollars) of riding a horse at Happy Farms and t represents the number of hours you ride. What does this equation tell you about the cost of riding a horse at Happy Farms?
What is The farm charges a $15 fee for riding a horse, plus $4 for each hour you ride.