Answer:  750x+520y=total cost
Step-by-step explanation:
750x+520y=total cost
 
        
                    
             
        
        
        
I can’t see anything on the thing bro
        
                    
             
        
        
        
10% of 50 is 5. 
Therefore 50+5=55 
Your answer is 5
        
             
        
        
        
Step-by-step explanation:
Let Andrew wage be = X
 
Cammi earns $20 more than Andrew So Cammi earns = 20 + X
Brenda earns $30 less than twice Andrew's wage
So she earns = 2X - 30
Their total combanied wage is $400
So Andrew + Cammi + Brenda = $400
X + 20+X + 2X-30 =400
4X - 10 =400
4X=400+10
4X=410
X= $102.5
So Andrew earns $102.5
Cammi earns $122.5
Brenda earns $175