10. Robert wanted to rent some video games. He had to pay a flat rate of $20, plus an additional amount of money for every game he rents. The total amount of money payed is a function of the
number of video games he rents, as represented on the graph below. Enter the rate of change for the money payed, measured as dollars per game, between 0 and 5 deliveries. (HINT: unit rate- how much does he pay per game?)