Chapter 9 - Roots and Radicals - 9.1 - Roots and Radicals - Problem Set 9.1 - Page 401: 71

$\approx 17.3 $

Using the properties of radicals, a rational approximation (to the nearest tenth) of the given expression, $ 9\sqrt{3}+\sqrt{3} ,$ is \begin{array}{l}\require{cancel} (9+1)\sqrt{3} \\\\= 10\sqrt{3} \\\\ \approx 17.3 .\end{array}