Add all of them and them subtract by the value
        
                    
             
        
        
        
It's C, just look at where the points are. 
 
        
                    
             
        
        
        
Answer:
i dont know if this is what u wanted but it wasn't really specified
Step-by-step explanation:
1(4 – 22); 2 – 2x
simplified:
−18;−2x+2
 
        
             
        
        
        
So 20% of 30 is 6
30% * 30 is 9
Alexa completed 6 of 30 questions 
Brent completed 9 of 30 questions
Brent completed 3 more questions than Alexa
Hope this helps :)