exam Maths Puzzle Numerical Ability

Sarah wants her $9000 GIC to double in value in nine years. What annual rate of interest is required for her to reach her goal. Assume interest is compounded annually.

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exam Other Question
Write the following phrase using symbols.
7 times the sum of a and m y= -x^2 x=-2 I think -2 * -2 =4 and then *-1 so the answer is -4?