Answer:
108
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
52 students were in each bus 
Step-by-step explanation:
475-7=468÷9=52 so 52
 
        
             
        
        
        
Answer: 3.5a+5b=470 and a+b=115
Step-by-step explanation:
 
        
             
        
        
        
Step-by-step explanation:
45+90+x=180
135+x=180
x=180-135
x=45
 
        
             
        
        
        
Answer:
D & E
Step-by-step explanation: