The whole papaer was pretty easy. EXCEPT question 16(after c). Thought I do know how to answer now.
For C. i.
we have x^2 + (y-c)^2 = r^2 and y = x^2
Solving simultaneously (FOR y - or for x but y is easier). We get y^2 + y(2c-1) - r^2 + c^2 = 0
From the graph and according to the...