Answer: Please rewrite your question or send a pic.  It is not clear what you are asking.
Step-by-step explanation:
 
        
             
        
        
        
I think it would have crystal formations if I remember correctly.
        
             
        
        
        
A = 10
Step by step
3+7=10
10+(-7)=3
        
             
        
        
        
Answer:
it might be B, but dont trust me on this one because im not so sure. 
Step-by-step explanation:
srry i just dont do this yet i havent rlly learned this but ik a bit abt it so yea. have a great night !
 
        
             
        
        
        
Answer:
6, 10, 5
Step-by-step explanation: