The answer to this question is c i think
        
                    
             
        
        
        
Answer:
-1
Step-by-step explanation:
 
        
             
        
        
        
Answer:
C 315
Step-by-step explanation:
 (12 + 30) * 15/2 = 315
 
        
             
        
        
        
Answer:
Step-by-step explanation:
if a is less than zero then b will from 4 down to negative infinity
so  b < 4
Does this help at all?   ask me some questions if you really want to learn about math ;)