Chapter 7 - Review - Page 470: 154

$\sqrt{41}\text{ units}$

Using the Distance Formula, $d=\sqrt{(x_1-x_2)^2+(y_1-y_2)^2}$, the distance between the given points is \begin{array}{l} \sqrt{(-3-(-8))^2+(5-9)^2} \\= \sqrt{25+16} \\= \sqrt{41}\text{ units} .\end{array}