Answer:
since you recorded the first marble then replaced it, you drew 10 blue marbles, so therefore we can predict the next marble you drew, was blue.
Step-by-step explanation:
 
        
             
        
        
        
The answers should be the last 2
        
             
        
        
        
I can’t seem to look at the bottom two answers and the two ( A and B) are not correct. So you’re left with either C or D
        
             
        
        
        
-3+7=4 should be your answer
        
                    
             
        
        
        
Since the variable x has an invisible one next to it, which is 1x, it is 6x.