book Maths Puzzle Numerical Ability

5-m
____
m-5

I put -1 is this correct???

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book Other Question

Ok, so I'm given 3 points of a parabola :(9,16) (0,12), and (27,0)..(9,16) is the vertex, (27,0) is an x-intercept, and (0,12) is the y-intercept. It can be inferred that (-9,0) is can you please help me to graph because im confuse to how to do it..
graph:(y-2)=-3/2(x=6)