Liquid leaked from a damaged tank at a rate of r(t) liters per hour. The rate decreased as time passed and values of the rate at two-hour time intervals are shown in the table. t (hr) r(t) (L/h) 0 8.3 2 8.1 4 7.8 6 7.6 8 7.4 10 7.2 Find lower and upper estimates for the total amount of liquid that leaked out of the tank in the first 10 hours. lower estimate = liters upper estimate = liters ว + 3 2 1 -~ 2 To find the blue shaded area above, we would calculate: [* f (x) dx a = area Where: a = f(x) = b = area