exam Maths Puzzle Numerical Ability

Simplify by removing factors of 1.

Z^2-13z+36/z^2+5z-36

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-4^2 + (-2)^4 - 3^3 - absolute vale of -4 - 4 What is the directrix of the parabola with the equation y+3= 1/10 (x+2)^2?