If he paid $57 monthly for 14 months, the total amount paid is:

He paid $798 in total
 
        
             
        
        
        
If by 104 and 103 you meant 10^4 and 10^3 the difference would be 10 because you subtract them as exponents and get 10^1 which is just 10. If you meant 104 and 103 as they are then the difference would be 6 as 104 x 6 is 6 more than 103 x 6.
        
             
        
        
        
If u check your answer on google ithink u can get
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation: