exam Maths Puzzle Numerical Ability

9:
(x3 + 4x2 - 2x + 5) - (3x3 - 3x2 + x - 2)

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exam Other Question

5(x+2)= 2x+16 Is this correct?

An 800 g solution of acid and water contains 128 g of acid. What percent of the solution is acid? 16%