exam Maths Puzzle Numerical Ability

Please help me, this question I need to simplify, the problem is:
n^-2
-
n^3
Please and Thank you=)

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exam Other Question

Solve: 4-(1/b)<3/b.

Thank you
Use synthetic division to perform the division

(x^3 - 5x^2 + 3x - 4) divided by (2x - 1)