exam Maths Puzzle Numerical Ability

How much interest will Ms. Williams earn if she invests $550 at 5% for 6 years?

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exam Other Question

A solution containing 30% insecticide is to be mixed with a solution containing 50% insecticide to make 200 L of a solutions containing 42% insecticide. How much of each solution should be used? i need to solve for all real roots

(sqrt)(2x^2+x-12)=x