exam Maths Puzzle Numerical Ability

Any help with this would be great. Thanks so much!

Maya has deposited $600 in an account that pays 5.64% interest, compounded continuously. How long will it take for her money to double?

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exam Other Question

When plotte on the rectangular coordinate system, in which quadrant would the following point be located for this polar coordinate? (-2, 2pi/3) Can someone please help me solve this ?
Determine a quadratic equation with integer coefficients that has roots -1+-4sqrt2/2 .