Answer:
If you want to simplify, -11 -132x
-132x
Step-by-step explanation:
 
        
             
        
        
        
A. Terms
b. 9
64 to 49 is -15, 49 to 36 is -13, 36 to 25 is -11, 25 to 16 is -9, so the next number is 16-7=9
        
             
        
        
        
The first one is 21.93 rounded up to 22.
        
             
        
        
        

Answer : This is because when 5z minus 5z, it is nullified, with no way to determine the value of z. 5z - 5z = 0
That is why there is no solution for this equation. 
Hope this helps. - M