exam Maths Puzzle Numerical Ability

sikplify by removing factors of 1

z^2-8z+16/z^2+5z-36

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exam Other Question

what is the complete solution to the equation /3-6x/=15? can someone please help me with this the multiple choices i have are

A.x=-2;x=-3
B.x=2;x=3
C.x=2;x=-3d
D.x=2;x=3d
E.x=-2;x=3
I need to find the altitude of the triangle

13 by 10 by 13

I have no idea how to do this.