exam Maths Puzzle Numerical Ability

How do you determine the (2,2), (1,4), (3,6), (-1,2) are function, domain or range?

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exam Other Question

find three consectuitve intergers such that twice the product of the first and second exceeds the square of the third by 4 given:
<rst= 50
<tsv=40
<X is a right angle
Prove:<rsv is congruent to <x