The answer is B. If you take the even root of a positive number, you'll get two solutions, a positive and a negative
        
             
        
        
        
Answer:
5.83 units
Step-by-step explanation:
See attached picture.  You can use the Pythagorean Theorem.  I added some lines to show the legs of a right triangle.  AB is the hypotenuse.

 
        
             
        
        
        
Incomplete question please add a image
        
             
        
        
        
Answer:
Step-by-step explanation: