#### Answer

$d\approx10.050
\text{ units}
$

#### Work Step by Step

Using $d=\sqrt{(x_1-x_2)^2+(y_1-y_2)^2}$ or the Distance Formula, the distance, $d$, between the given points, $\left(
-1,-30
\right) \text{ and } \left(
-2,-40
\right),$ is
\begin{array}{l}\require{cancel}
d=\sqrt{ \left(-1-(-2) \right)^2+\left(-30-(-40) \right)^2}
\\\\
d=\sqrt{ \left(1 \right)^2+\left(10 \right)^2}
\\\\
d=\sqrt{ 1+100}
\\\\
d=\sqrt{ 101}
\\\\
d\approx10.050
\text{ units}
.\end{array}