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Q: Is 1.5 a irrational number

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irrational

15 is a rational number

It is not irrational but it is all of the others.

rational

The square root of 15 is an irrational number and it is about 3.873 rounded to three decimal places

No, it is rational.

No, it is not. And it is not irrational either.

Yes

No. Irrational numbers are numbers which cannot be expressed as a fraction p/q where p and q are integers. Because 15 can be expressed as 15/1, it is not irrational. It is actually a rational number and an integer.

It is a negative number. It is also rational because it can be written as -15 / 1

No because 15 times pi is an irrational number

The square root of 15 is an irrational number

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