Because it has the expression (of a number or quantity) expressible, or containing quantities that are expressible, as a ratio of whole numbers. When expressed as a decimal, a rational number has a finite or recurring expansion.
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eggdrian
Not because it has a radical sign. If you see a radical sign it means the given is not a rational.
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Rational
Because it has the expression (of a number or quantity) expressible, or containing quantities that are expressible, as a ratio of whole numbers. When expressed as a decimal, a rational number has a finite or recurring expansion.
Sana po makatulong