Answer:
1. D
2. AE (with a line above the 2 letters)
3. AC (with an arrowpointing to the right above the 2 letters)
4. B, A, and C
 
        
             
        
        
        
Answer:
<AEB = obtuse angle 
<AED = straight angle 
<BEA = obtuse angle 
<BEC = straight angle 
<CDE = not angle
<CEA = acute angle 
<DEA = straight angle 
<DEB = acute angle 
<DEC = obtuse angle 
Step-by-step explanation:
 
        
             
        
        
        
Number of vertices of hexagon is 6
        
                    
             
        
        
        
Answer: a + 4
explanation: sum means what comes from two numbers being added. so you just need to add a and 4