Emma is driving on a long road trip. She wrote an equation to represent how many gallons of gas she has left in her tank, g = 14.5 0.45h, where g represents the - number of gallons and h represents time in hours. What could the number 0.45 represent in the equation? How quickly the car uses gas, in gallons per hour. The number of gallons in the tank after one hour. How long it takes Emma to run out of gas. The number of gallons of gas initially in the tank.