Answer
$5$
Work Step by Step
To calculate the distance f$d$ between two points, we have:
$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$
Substitute the $x$ and $y$-coordinates of the given points, to obtain:
$d=\sqrt{[2-(-1)]^2+(4-0)^2}=\sqrt {9+16}=\sqrt{25}=5$
