book Maths Puzzle Numerical Ability

A commonly asked question is, "How long will it take to double my money?" At 10% interest rate and continous compounding, what is the answer?
The base amount should be $10,000 and the compounding rate is 2.7183.

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im so sorry, i was sick and my teacher was gone when i came back, so left out
how would i sipmlify radican 15/49 Given f(x) = 3x^3 - 1 , find f^-1(x). Then show that (f o f^-1)(x) =x.

^I hope that this makes more sense to you than it does to me. Could you please explain to me how to do a