exam Maths Puzzle Numerical Ability

Simplify:
a) (3x(^8)m(^-3))^-3
b)(-x(^0)+x(^2))^-1
c)(4a^2-a^-2)^-2

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exam Other Question

I need help with this problem -3x < -6 or x + 5 < -2

The second symbol was supposed to be greater than equal to, I just couldn't make the symbol.
x-c^c+a=a