Cesar Renta a bicycle for a flat rate plus $10 per hour. He models the cost of the rental with the function f(x)= 10x+15, where x is the number of hours he rents the bicycle, and f(x) is the total cost of the bicycle rental, including the flare rate and the hourly fee. What is the flat rate for the bicycle rental?
The flat rate for the bicycle rental is the constant term in the function f(x).
In this case, the constant term is 15.
Therefore, the flat rate for the bicycle rental is $15.