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Yes. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.

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Q: Is a rational number plus a rational number rational?

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If both numbers are rational then x plus y is a rational number

Yes, it is.

Yes, the sum is always rational.

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They add up to 17.02 which is rational number

The way in which the binary functions, addition and multiplication, are defined on the set of rational numbers ensures that the set is closed under these two operations.

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