Jocelyn is going to the amusement park, where she has to pay a set price of admission and another price for tickets to go on each of the rides. The total amount of money Jocelyn will spend is given by the equation y = 3.5 x + 28 y=3.5x+28, where y y represents the total amount of money, in dollars and cents, and x x represents the number of rides Jocelyn goes on. What could the number 28 represent in the equation?