book Maths Puzzle Numerical Ability

What is the equation and solution to find how long it takes for an investment to double in value if it is invested at 8% compounded monthly?

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Can someone please help with this question:

Solve the following system of equations:
-x+5y-2z=2
-x+4y+5z=1
x-6y+4z=-3


Thanks,
Find all sets 0f four positive consecutive integers such that the sum of the cubes of the first three is the cube of the fourth.