4) The graph shows how the amount Amanda earns each day depends on the number of hours she works. Which unit would be appropriate for the rate of change in the graph? 2001 Amanda's Earnings 180 160 140 8120 Amount Earned (dollars) 100 80 60 40 222883R 20 0 1 2 3 4 5 6 7 8 9 10 Time Worked (hours)