exam Maths Puzzle Numerical Ability

{(2,4),(3,5),(4,6),(5,8)} State whether each relation is a function.

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Can someone help me solve this problem?
I need this problem to be evaluate:

|4| + |-3|

Thanks,
Sher Using the numbers 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, find four consecutive numbers whose sum is one half the sum of the other eight numbers.