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Mathematics 11 Online
OpenStudy (anonymous):

Which sets of numbers are closed under subtraction? Choose all answers that are correct. A. whole numbers B. negative integers C. integers D. rational numbers

OpenStudy (anonymous):

This will tell you -> http://openstudy.com/study#/updates/543958f9e4b03c98eb601174

OpenStudy (anonymous):

Imaginary!

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