#### Answer

$\sqrt 7$

#### Work Step by Step

Simply put, an irrational number is any real number that isn't a rational number. That is to say, it is any number that can't be expressed as $\frac{a}{b}$, where $a$ and $b$ are both integers and $b\ne0$.

Published by
Pearson

ISBN 10:
0321785045

ISBN 13:
978-0-32178-504-6

$\sqrt 7$

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