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Closure of the set of integers under addition.
Not particularly, you'd need to be under 25 to even represent Sao Tome internationally.
18 meters is just under 60 feet.
-3 is a negative integer. The absolute value of -3 is +3 which is not a negative integer. So the set is not closed.
Well, my friend, if you're 10 strokes under par in golf, that means you're playing beautifully! In terms of integers, being under par would be represented by negative numbers, so 10 strokes under par would be represented by the integer -10. Keep up the good work on the course, and remember to enjoy the journey!