exam Maths Puzzle Numerical Ability

Can you solve:

a^4-b^ over 2ab times 2a^2-ab-3b^2 over a^2+b^2

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exam Other Question

I am absolutely speechless with this problem. I have asked everyone I know and looked for help and nothing. Please help me.

The problem is:

V=(pi)R^2h-(pi)r^2h Solve for r^2
how can i tell if a -674 is a interger or a whole number or a natural and are all numbers integers