exam Maths Puzzle Numerical Ability

Simpliy: This is so complicated please help.

2/z^2 - 3/2 / 2/5z^2 + 1/3z

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Is the following trinomial a perfect square?
x^2 - 14x + 49 saw a bord 8ft 4 in long into nine equal pieces. if the loss per cut is 1/8 in.,how long will each piece be