exam Maths Puzzle Numerical Ability

Solve the equation:

y^2 - 3y - 18 over y^2 - 4 divided by y^2 + 5y + 6 over y - 2

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exam Other Question

My problem is I have a pool with an overall length of 60' and an overall width of 30'. The shallow end has a length of 25' and depth of 4'. The deep end has a length of 25' and d I know how to do these I really just need to be refreshed the question I am having trouble with is .5n(n+1)to the second power