Robin spen 17 dollars for admissions for an amusement park if she paid 5 for admission and rides cost 3 dollars what is the total number of rides that she went on

Our equation for this situation is C(x) = 3x + 5, where C(x) is the total cost paid, 3 is the amount per ride x, and 5 is the cost to just walk in, rides or no rides.  Our total cost is 17, so we can sub that in and solve for x.  17 = 3x+5.  Subtract 5 from both sides to get 12 = 3x.  Divide both sides by 3 to get x = 4.  She rode 4 rides.