$\frac{ 6 }{ \sqrt{ 3 } }$
Multiply the fraction by $\frac{ \sqrt{ 3 } }{ \sqrt{ 3 } }$$\frac{ 6 }{ \sqrt{ 3 } } \times \frac{ \sqrt{ 3 } }{ \sqrt{ 3 } }$
To multiply the fractions, multiply the numerators and denominators separately$\frac{ 6\sqrt{ 3 } }{ \sqrt{ 3 }\sqrt{ 3 } }$
When a square root of an expression is multiplied by itself, the result is that expression$\frac{ 6\sqrt{ 3 } }{ 3 }$
Cancel out the common factor $3$$\begin{align*}&2\sqrt{ 3 } \\&\approx3.4641\end{align*}$