A. To graph the equation using pen and paper, plot points and then join them up. Eg. if x = 1, then y = 0.75192. If x = 2, y = 0.75384. And so on...
B. Use the quadratic formula: You will get 2 answers, use the one most appropriate for the distance travelled.
C. Differentiate the equation, then substitute in h'(d) = 0. (Gradient 0) This will give you the distance. Substitute this value into your original equation to find the maximum height.
D. The horizontal distance travelled is the area under the graph, so you have to integrate it. Can you figure it out for yourself?