HELP ASAP PLEASE :) a car magazine wants to determine the macimum rpm of a car. the following graph shows the equation y=-2x^2+8x. the equation representa the function for the rpm of the car in thousands, where the rpm is y and the number of seconds is x. 1. The maximum rpm for the car is?
A. 6,000 rpm
B. 8,000 rpm
C. 10,000 rpm

2. the engine returns to idle and the rpm becomes 0 at?
A. 2 seconds
B. 3 seconds
C. 4 seconds

3. The rpm of the car increases for the first?
A. 2 secs
B. 3 secs
C. 4 secs

4. Then it decreases for the next
A. 2 secs
B. 3 secs
C. 4 secs

5.the axis of symmetry is?
A. 2 secs
B. 3 secs
C. 4 secs