The following graph shows the relationship between the number of Frisbees produced and the cost of production. The vertical intercept is $ and the slope of the line is $ per Frisbee. Point c shows that the cost of producing Frisbees is $ The cost of producing 15 Frisbees is $ 180- 170- 160- 150- 140- > 130- 120- 110- 100- 90- 80- 70- 60- 50- 40- 30 20- lb a 10- 0- 15 20 25 30 35 40 5 10 Frisbees per day (X) Costs per day (Y)