7 120 1 30 18 The number of gallons of gasoline in a truck s tank at time t is given by the twice differentiable function S where t is measured in minutes and 0 t 240 which the number of gallons of oil in the tank is changing at time t 140 minutes 1 point Estimate the rat 0 30 90 180 240 t minutes S t gallons 16 15 12 7 2