Question

f 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.

Answer 1

The answer is D) Yes; because x and y must be integers, and integers are rational.