a)You have the equation for height, so the initial height of the ball would be the height at time 0, plug in t=0
b)You also have an equation for velocity, so for initial velocity plug in t=0
For c) plug 2 into the equation for velocity, if velocity is negative, then the height is decreasing
For d) you can either use what you know about the parabola, or basic physics would tell you that at the max height, the balls velocity is 0, so solve when v(t)=0
For e) solve for when the height =0, and get the time...
how did you get your answers to begin with?