Question

Can somone show me how this is done. http://puu.sh/nWmx7/51e4346f92.png

Answer 1

http://www.purplemath.com/modules/distform.htm

Answer 2

The distance between two points can be found with the distance formula, which is derived from the Pythagorean theorem. It's \[d = \sqrt(x2-x1)^2+(y2-y1)^2\], where the two coordinates are (x1, y1) and (x2, y2).
Now just substitute the given coordinates and find your distance.