#### Answer

$\underline{n^{th}}$;
$\text{index}$

#### Work Step by Step

The expression $\sqrt[n]{a}$ represents the nth root of $a$.
We call the number $n$ the index.

Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$\underline{n^{th}}$;
$\text{index}$

The expression $\sqrt[n]{a}$ represents the nth root of $a$.
We call the number $n$ the index.

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