Well, for -6d to equal -13d, d would have to be 0 to satisfy this equation
        
                    
             
        
        
        
Your answer is D because 10*2 is 20 and 6*2 is 12 so 12 out of the next 20 customers will purchase a sandwich.
        
                    
             
        
        
        
I think u add not sure though
        
                    
             
        
        
        
(6 - 2) - 1 = 4 - 1 = 3
6 - (2 - 1) = 6 - 1 = 5
The associative rule doesn't work for subtraction because you get different results when you move the parentheses.
 
        
             
        
        
        
Answer:
A
Step-by-step explanation: