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Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.
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Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.
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Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?
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7/x+2 + 3x-4/x2+5x+6=9...
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