exam Maths Puzzle Numerical Ability

Mary 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

prove that the sum of the angles of any quadrilateral is 360 degrees.

does it have to do with the expression: (n-2)180
where n is the number of sides? Please help me solve this problem. Please give three significant digits.(I need to use logarithms also.)

2^x-2=14