exam Maths Puzzle Numerical Ability

Please help me solve this problem. Please give three significant digits.(I need to use logarithms also.)

2^x-2=14

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exam Other Question

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. What is the sum of the solutions of the equation 3x^2+11x=4?