Answer:
-9
Step-by-step explanation:
The mode is the value that appears most often in a set of numbers, and the number -9 appears the most in this set. 
 
        
             
        
        
        
Answer:
135 cupcakes
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
-30
Step-by-step explanation:
-4b^6 + -24b^6 = -30b^6