exam Maths Puzzle Numerical Ability

I am just starting 7 grade please show me how to find the missing numbers n,8,18,3,6,and 3 mean =9

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exam Other Question

Please help,

Find the value for the correlation coefficient r.

x 5, 1, 4, 2, 3
y 5, 10, 12, 4, 8

Please help factoring: quadratic equations and completing the square
x^2-3x, piex^2+3pie, sqroot2 x^2+2x (for this last equation the x^2 is not inside the sqroot)