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5.4 is a rational number, as it can be expressed as a fraction.

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Q: Is 5.4 rational or irrational

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It is rational.

No. A rational plus an irrational is always an irrational.

rational

It is always irrational.

The product of a rational and irrational number can be rational if the rational is 0. Otherwise it is always irrational.

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It is rational.

rational. Just remember that a rational number is one that may be formed from a ratio. e.g. -108/2.

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Rational.

No

If x is rational the it is rational. If x is irrational then it is irrational.

Rational. Rational. Rational. Rational.