exam Maths Puzzle Numerical Ability

how do you known if a set is closed under addition. Example {1,3,5,7} is it closed or not?

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exam Other Question

8 x 144/12x24+ (1500-1000/500)to the 25 power -37 to the 0 power +2x7 . Total answer divided by (30-54/4) to the 5-4 power -180/12 Please help. If yo Why do intersecting lines represent a unique solution? Give examples to support your answer.