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No, it is rational.

No.

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Q: Is 1.6490221 irrational

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Irrational. Irrational. Irrational. Irrational.

It is irrational.

Rational

Such a sum is always irrational.

If it says "negative irrational", then obviously it is irrational.

No

The square root of 94 is an irrational number

irrational

yes

Yes. The sum of two irrational numbers can be rational, or irrational.

-Pi is irrational, because it does not terminate or repeat. Whenever you multiply an irrational number by a rational number (-1), the result is an irrational number.

Irrational