The rate of healing A t in square centimeters per day for a certain type of abrasive skin wound is given approximately by the table CE t 0 A t 0 99 t 4 A t 0 62 1 0 83 2 0 73 3 0 68 5 6 7 0 55 0 47 0 42 A Use left and right sums over five equal subintervals to approximate the area under the graph of A t from t 0 t 5