Answer:
>
Step-by-step explanation:
 
        
             
        
        
        
There's nothing to substitute, and no solution, 
until somebody gives you another equation.
        
             
        
        
        
Answer:
A,B,D
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:

<em>Answer</em><em> </em><em>B</em><em> </em><em>is</em><em> </em><em>correct</em><em>.</em>
 
        
             
        
        
        
80, 50 times 9.90 is 495 and 80 times 5.30 is 424, 424 + 495 = 919