Chapter 8 - Section 8.2 - Multiplying and Dividing Radicals - Exercise Set - Page 585: 10

$\sqrt{0.6xy}$

Using $\sqrt{x}\cdot\sqrt{y}=\sqrt{xy}$ or the product rule of radicals, the given expression, $ \sqrt{0.2x}\cdot\sqrt{3y} ,$ is equivalent to \begin{array}{l}\require{cancel} \sqrt{0.2x(3y)} \\\\= \sqrt{0.6xy} .\end{array}