John is standing at the edge of a lake and he throws a stone towards the lake.  If the height of the stone above the lake with time in seconds is given by the function y = -0.02x + 0.92x + 7.92 feet.

(a) What is the maximum height of the stone above the lake?
(b) Where and when does the stone hit the water?
(c) How high is the stone when John releases it?
(d) If the bottom of the lake slopes downward with a slope of -1/4, what is the maximum height of the ball above the bottom of the lake?
 
 
 
 

Answer - Draw or sketch it!