Answer:
80
Step-by-step explanation:
500 to 900? = 80.
 
        
             
        
        
        
Answer:
3,240
Step-by-step explanation:
 
        
             
        
        
        
Answer:
1
Step-by-step explanation:
x-y+xy=1-1+1*1=0+1=1
 
        
                    
             
        
        
        
It is -2.  This is negative.  For instance, if you had 3 candies and your mother took away 5, you would not only have 0 candies, but you would owe your mother 2.  This is expressed as a negative number.  Please mark Brainliest!!!