exam Maths Puzzle Numerical Ability

Solve each of the following inequality. Express your final answer using inequality.

-22<2z-4<0

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exam Other Question

y = 2x^3 + ax^2 + b It says to simplify:
a/8-3/2a^2 (/ is a radical sign)
I have come to the conclusion that this can not be simplified! Am I right?
Thanks for your input!
ac