The function gives the total cost, in dollars, for a plumber's service that takes hours. Which of the following is the best interpretation of ?
If the plumber's service takes 3 hours, the total cost is $65.
If the plumber's service costs $3, it takes 65 hours.
If the plumber's service takes 65 hours, the total cost is $3.
The plumber charges $65 per hour for 3 hours of service.
