exam Maths Puzzle Numerical Ability

Add or subtract as indicated. Express your result in simplest form
3/ x^2 + 4x +3 - 1/ x^2 - 9

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exam Other Question

If there are 900 people in the town, how many people have cats & dogs. This is 22 %. So how do I figure out this solution?

Please help Write in standard form: -i+(7+5i)-3(2-3i)