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Elzapp · Answer 1 · 2018-12-16T14:20:46+0000

Answer:

$8.1\pi$ is an irrational number.

Explanation:

We are asked to find the subset to which 8.1 pi belongs.

We know that
$\pi$ is an irrational number. We also know that the product of any non-zero rational number and an irrational number is always irrational.

We can see that 8.1 is a non-zero rational number.

Therefore,
$8.1\pi$ is an irrational number.

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