Correct. Given the points (-1, 2) and (5, 4), the distance between them is $\displaystyle\sqrt{{{{\left({x}_{{1}}-{x}_{{2}}\right)}}^{{2}}+{{\left({y}_{{1}}-{y}_{{2}}\right)}}^{{2}}}}=\sqrt{{{{\left({\left(-{1}\right)}-{5}\right)}}^{{2}}+{{\left({2}-{4}\right)}}^{{2}}}}=\usepackage{cmbright}\Huge\$ $\displaystyle\sqrt{{{{\left(-{6}\right)}}^{{2}}+{{\left(-{2}\right)}}^{{2}}}}=\sqrt{{{36}+{4}}}=\sqrt{{{40}}}={2}\sqrt{{{10}}}\usepackage{cmbright}\Huge\$ .