Jay went to an amusement park. The park charges an entrance fee of $10.50 and $4.50 for every ride. Jay spent $46.50 on entrance fees and rides.
Which function can be used to find the number of rides he went on?

A. f(x)= 4.5x+10.5

B. f(x)= 4.5x

C. f(x)= 4.5x-10.5

D. f(x)= -4.5x