Answer
$2\sqrt5$
Work Step by Step
The distance formula from $P_1(x_1,y_1)$ to $P_2(x_2,y_2)$ is $d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$.
Hence here: $d=\sqrt{(-0.5-3.5)^2+(6.2-8.2)^2}=\sqrt{(-4)^2+(-2)^2}=\sqrt{20}=2\sqrt5$
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