exam Maths Puzzle Numerical Ability

I am having some problems with these problems

Subtract express your answer in simplist form 2/5-y/y-2

and Add. Express your answer in simplist form x-13/x^2-x-12+3x-3/x^2-x-

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exam Other Question

How do you sketch the graph of the following function
f(x+1)
A circular grass lawn has a radius of 6 m. Fertilizer is to be broadcast at the rate of 1 kg for every 25 square meters. If the fertilizer can be bought in 1-kg bags, how many bags