A car magazine wants to determine the maximum rpm of a car. The following graph shows the equation y=−2x2+8x . The equation represents the function for the rpm of the car in thousands, where the rpm is  y and the number of seconds is x .   The maximum rpm for the car is (1 point) Responses 6,000 rpm 6,000 rpm 8,000 rpm 8,000 rpm 10,000 rpm 10,000 rpm Question 2 The engine returns to idle and the rpm becomes 0 at(1 point) Responses 2 seconds 2 seconds 3 seconds 3 seconds 4 seconds 4 seconds Question 3 The rpm of the car increases for the first(1 point) Responses 2 seconds 2 seconds 3 seconds 3 seconds 4 seconds