book Maths Puzzle Numerical Ability

Hii i need help on this problem. And the question says write each expression as a simple fraction... -5 to the -3 power

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my question is:
solve 6m-5n=-14 for m
thanks
Help...This has me stumped..
How long does it take for an investment to double in value if it is invested at 10% per annum compounded monthly? Compounded continuously??
I got th