Mathematics, 27.06.2019 23:30, william1690
If x + y is rational, must x and y each be rational? a) yes; because the sum of rationals is rational. b) no; because the sum of irrationals is always irrational. c) no; because x and y could be additive inverses of each other. d) yes; because x and y must be integers, and integers are rational.
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If x + y is rational, must x and y each be rational? a) yes; because the sum of rationals is ratio...
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