exam Maths Puzzle Numerical Ability

I kmow the formulas to these problems.I just have a hard time with setting them up and firguring which step is 1st and so on. Can you help me with this please?

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exam Other Question

Simplify and write the answer with all exponents positive.

w-1 powert-3 power s/w-2 power s4 power t 3 power
simplify: (x^-2)^n-2/x^4