A plumber charges a flat rate for coming to a person’s home and then charges an hourly rate for the amount of time he spends there. The amount of money he charges is given by the function equation C = 75 + 40t, where C is the amount he charges and t is the time he spends at a home in hours. What is the meaning of the vertical intercept in this equation? A. The plumber charges $40/h. B. The plumber charges $75/h. C. The plumber charges a flat rate of $40. D. The plumber charges a flat rate of $75.
The vertical intercept is $75. That is the amount charged at zero hours.