Answer:
haha pues cuesta mas las hamburgesas porque toca ir al doctor despues
Step-by-step explanation:
 
        
             
        
        
        
Answer:
9 -3x-12
-3x-12
9 +6x-7-9x-5
+6x-7-9x-5
(Group liked terms)
9 +6x-9x-7-5
+6x-9x-7-5
( subtract the numbers ) -7-5= -12
9 +6x-9x-12
+6x-9x-12
( add similar elements ) 6x-9x=-3x
9 -3x-12
-3x-12
Step-by-step explanation:
 
        
             
        
        
        
Answer:
12.60
Step-by-step explanation:
To find the tip, take the amount of the bill and multiply by 30%
42 * 30%
Change to decimal form
42 * .30
12.6
 
        
                    
             
        
        
        
Answer:
Elimination 
Step-by-step explanation:
You would not do substitution since it would not work so you do elimination since the 4y and -4y eliminate then you just solve for it.
 
        
             
        
        
        
well, what is 9,744/2,280? take that and move the decimal point two places to the right to find the answer.