book Maths Puzzle Numerical Ability

Tutor please help me too answer this guestion.
I need to determine whether this relation is a function...
[(5,-2),(3,2),(4,-1),(-2,2)]

P.s What is a function?

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book Other Question

The distance seen in miles from a height of h feet on Earth is d = square root 3h / 2 . If we can see approximately 35 miles from the top of the Cityspire in New York, estimate i given that angle ABD=2y and angle DBC=6y-2, find angle DBC