Sum means addition 
negative 18 means -18
a number can be x
Sum of negative 18 and x should be 11
thus the equation is
 
 
        
        
        
Answer:
9/20
Step-by-step explanation:
45%=45/100
hope this helps
 
        
             
        
        
        
Answer:
i love you
Step-by-step explanation:
hhehehehhe
 
        
             
        
        
        
38 quarts because four quart equals  one gallon.
        
                    
             
        
        
        
 Answer:
The first one
Step-by-step explanation:
the first one is biased because it is not random but rather people who are using the library. They will obviously be biased towards the library