This would be easier for you if you put it in a graph
        
             
        
        
        
Answer:
1 2 3
Step-by-step explanation:
 
        
             
        
        
        
Yes they are equivalent expressions. If you take the z to the power of two, and subtract that from the other z to the power of two, it is zero. So you are left with four which is the answer
        
             
        
        
        
Answer:
200 minutes
Step-by-step explanation:
$20/$0.10=200