14. A fountain at a city park shoots a stream of water vertically from the ground. The function y = −8x2 + 16x models the height of the stream of water in feet after x seconds.
a. What is the maximum height of the stream of water?
b. At what time does the stream of water reach its maximum height?
c. For how many seconds does the stream of water appear above ground?
d. Identify a reasonable domain and range for this function.

I'm stuck on A, C, and D