Answer:
8
Step-by-step explanation:
 
        
             
        
        
        
Answer:i dont know just jot down something but i dont care let me submit this 
Step-by-step explanation:
listen if u are not taking the test just blop something down and they dont look at the awnser if they do then i dont know friendly hint
 
        
             
        
        
        
Answer:
a
Step-by-step explanation:
Greatest Common Factor is the "biggest" number that each have in common
20 a bbb  +  16 aa b    +   a
the only thing all three have in commom is the "a"