AB=4.5
Explanation:
You have to use the formula they give you down below.
The coordinates of A are (3,1) and the coordinates for B are (-1,-1).
Then to plug it into the formula, this would be what you use: x1=3, x2= -1, y1=1, y2= -1. Plugging it into the formula should look like this:
[tex]d = \sqrt{( - 1 - 3) {}^{2} + ( - 1 - 1) {}^{2} } [/tex]
Simplify and you get √(-4)²+(-2)². Use the square roots and you get √16+4, or √20. √20 in decimal form rounds to 4.5.
Hope this helps!
