2 (a) = 6c^2-d/4 (i) Find f when c = 8 and d =-4. (ii) Express c in terms of d and f. (b) Solve 17 - 5x =< 2x + 3 . (c) Factorise 9 - 25x^2. (d) Factorise completely 8px + 6qy - 3qx - 16py . (e) Solve 5x^2 + 6x - 13 = 0 Give your answers correct to two decimal places.