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.
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