Answer:
true
Step-by-step explanation:
(-8) + 9=1
9+(-8)=9-8=1
 
        
                    
             
        
        
        
Step-by-step explanation:

 
        
             
        
        
        
Answer:
your answers are in the attachment 
hope it helps...
Step-by-step explanation:
 
        
             
        
        
        
Answer:
6xy
Step-by-step explanation:
(2x) × (3y)
=(2×3) × (x×y)
=6×xy 
=6xy
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
Using the formula 
Initial -final/initial =%/100
89-72/89 =%/100
17/89 =%/100
Making %subject of the formula
% =17*100/89
So % =1700/89
%= 19.101
Therefore rounding off the answer we have 
X=19%