exam Maths Puzzle Numerical Ability

Find the distance between (12, �3) and (0, 2). i think its 13.42 but that doesnt sound right.

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exam Other Question

I need some help
Express answer in simplist form:
8/s+8/s^2

and also
Simplify

x+2/x/ x-2/3x How do you completly factor 6y^2 - 54, whats the answer?