Let f be the function given by f(x) =Inx" + x". What is the value of f '(1)? (1 point) O O 2 2.5 O 5 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 s t s 240. Estimate the rate at which the number of gallons of oil in the tank is changing at time t = 140 minutes. (1 point) t (minutes) 0 30 90 180 240 S(t) (gallons) 16 15 12 7 2 O 7 120 O 1 30 O - 18 O - 10