a) 115 is the height the stone is thrown from
b) dunno if right, but i got...
So A=113.4375, B=4.9, C=5/4
but doesn't work out for part c)i)
c)ii) maximum height above ground is the height the stone is dropped at? so 115? and time will be 0, since that's where the stone is dropped.
In general, I think the question is wrong...but I am not sure....Could you type out the whole question, pls?