exam Maths Puzzle Numerical Ability

Find the inverse function for f(x)= x^3 + 3

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exam Other Question

solve this system of equations. if it is unsolvable say so.
3x + 4y + 5z=8
1x - 2y + 3z= -6
2x - 4y + 6z=8
sorry i cant seem to figure this one out
SOLVE FOR X

0.05x+0.065(5000-x)=295

THANKS ALOT