A. 12.08
9 + 2 = 11 
(So, 11 across on our x - axis from - 9 to 2) 
Then, up 5 from 2 on our x-axis
Join the 2 dots of coordinates, & creating a triangle. Base 11, height 5
Use Pythagoras Theorem, to find that distance between the coordinates (the hypotenuse) 
Root 11^2 + 5^2 = 12.083056...
(root means square root) 
Hope this helps!