Question

is the number $\pi + -9$ rational or irrational?
rational
irrational
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Explanation:

A rational number can be expressed as a fraction of two integers ($\frac{p}{q}$, $q
eq0$). An irrational number cannot be expressed this way. $\pi$ is irrational. The sum of an irrational number and a rational number ( - 9 is rational) is irrational. So $\pi + (-9)=\pi - 9$ is irrational.

Answer:

irrational