8.54
Simplest way to do it is using the Pythagorean Theorem
c^2 = a^2 + b^2
You want c. We can get a and b from the chart by seeing that the horizontal distance from A to B is 8 and the vertical distance is 3. Otherwise,
a = |-4| + 4 = 8, horizontal distance
b = |-5| + |-2| = 3, vertical distance
Then,
[tex]c = \sqrt{ {8}^{2} + {3}^{2} } = \sqrt{73} = 8.54[/tex]
