1. Simplify (x^2-y^2)/(x^2+ xy)
2. Simplify (324-4y^2) / (2y+18)
3. If 2/(x-3)-3/(x-2) is equal to P/(x-3)(x-2) , find P
4. Simplify (a-7)/( a^2- 9) × (a^2- 3a) / (a^2- 49)
5. If R = (x : x2 = 16, x > 5), then R is equal to...
6. If X={0,2,4,6},Y={1,2,3,4} and Z={1,3} are subsets of μ= {x:0≤x≤6}, find X∩(Y'∪ Z).
7. Simplify (1/a^(-1) +1/b^(-1) )^(-1)
8. P and Q are two sets. If n(P∪Q)=45 and n(P)=25 and n(Q)=35, then n(P∩Q) is