it would be appropriate to round a number when you are talking about people or animals. Ex. it fits 10 1/2 people. it will most likely fit 9-11 people. 
You it is not appropriate to round with money. 
Ex. If you owe someone $9.43 you don't just give them $9
 
        
             
        
        
        
Answer:
The population of the mice will decrease to the faster, stronger, and smarter mice because the weaker will die because of natural selection.
Explanation:
 
        
             
        
        
        
Answer is 3. Volume= mass divided by density
        
                    
             
        
        
        
charged objects will either attract or repel other charged objects
 
        
                    
             
        
        
        
Answer: B.) 6 
Explanation:
To answer this problem you get the number of students who attended Wednesday (18) and the number of students who attended Tuesday (12) and subtract 18 - 12 = 6 
Answer = B.) 6