exam Maths Puzzle Numerical Ability

what is m-8 divided by m squared minus 7m minus 8
m+7

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exam Other Question

Solve to four decimal places: 3.9^(m-4)=10.21.

Thanks Is the relation {(3,2), (1,-2), (-2,2), (-5,8)} a function? I said "Yes", but now I am worndering because of the (-2,2)? does this make it not a function?