Chapter 10 - Exponents and Radicals - 10.7 The Distance Formula, the Midpoint Formula, and Other Applications - 10.7 Exercise Set - Page 679: 58

$d\approx9.946 \text{ units} $

Using $d=\sqrt{(x_1-x_2)^2+(y_1-y_2)^2}$ or the Distance Formula, the distance, $d$, between the given points, $( 5.9,2 ) \text{ and } ( 3.7,-7.7 ),$ is \begin{array}{l}\require{cancel} d=\sqrt{(5.9-3.7)^2+(2-(-7.7))^2} \\\\ d=\sqrt{(2.2)^2+(9.7)^2} \\\\ d=\sqrt{4.84+94.09} \\\\ d=\sqrt{98.93} \\\\ d\approx9.946 \text{ units} .\end{array}