exam Maths Puzzle Numerical Ability

I am anew student at this mean mode and median I wish you would show me how to find a missing number I got this problem n,8,18,18,3,6,3 mean=9 How do I find n?
also this one find n 5,17,5,n,5,4 range=14 mean==

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exam Other Question

what is (-xy^2)^3(2x^2y)^2 if you are multiplying with monomials I need to factor completly

x^8-1
and
y^3+125