book Maths Puzzle Numerical Ability

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

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12n^2+8n=0 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?