CD, CE, HG, GF, AL, LB, AB, HF, DE. A line segment is comprised of any two points. The ones I listed are the ones specifically named in the picture.
        
                    
             
        
        
        
Your answers should be B and D
When naming angles, they all need to be connected on the line without overlapping any points previously said. Angle YXZ is incorrect because X is not on the same line as Z. YW is a line because both sides continue on forever, as indicated by the arrows.
Hope this helps!
        
             
        
        
        
No because 2/5 equals 4/10, which is .4, not .25 :)