Yes 9 times pi is an irrational number because it can't be expressed as a fraction
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-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.
It is irrational, just like pi
An irrational number cannot be written as a fraction or a whole number,Like Pi for example
A non-zero rational number (10) multiplied by an irrational number (pi) is always irrational.
That's the number pi, and yes, it is irrational.