Answer:
a box of 10 balls for $9?
Step-by-step explanation:
because u buy 10 tennis balls for 9 dollars and the first one is not true 
becuase u buy 3 balls of tennis with 3 dollars and the last answer is right 
becuase you buy 10 balls for 9 that means its 1 dollar less for 10 balls 
hope it helps 
 
        
             
        
        
        
1. x - y
2. xy 
3. y / x
4. x+y
5. y= x-6
6. 6x =y
7. y-x
8. x/y
9. x+y= 6
10. xy= 6
        
             
        
        
        
Answer:
11
Step-by-step explanation:





 
        
             
        
        
        
Answer:
4.444
Step-by-step explanation:
mark me brainliest plz