exam Maths Puzzle Numerical Ability

Factor the expression completely.

9a^4 + 11a^3b + 2a^2b^2

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exam Other Question

whats 21% as a degree out of 360% If prices,P, are reduced by 20% and sales are increased by 25% what is the effect on the total recepiets?
(a)increased by 5% (b)decreased by 5% (c)are unchanged (d)none of