9. A driver of a new car periodically keeps track of the number of gallons of gas remaining in their car's tank, while simultaneously tracking the trip odometer mileage. Their data is recorded in the following table. Note that at mileages where they add fuel to the tank, they record the mileage twice: once before fuel is added, and once afterward. Table 1.2.20. D (miles) 0 50 100 100 150 200 250 300 300 350 G (gallons) 4.5 3.0 1.5 10.0 8.5 7.0 5.5 4.0 11.0 9.5 Use the table to respond to the questions below. a. Can the amoung of fuel in the gas tank, G, be viewed as a function of distance traveled, D? Why or why not? b. Does the car's fuel economy appear to be constant or does it appear to vary? Why? c. At what odometer reading did the driver put the most gas in the tank?