What the other person said
        
                    
             
        
        
        
 Answer:

Step-by-step explanation:
 we can easily calculate the perimeter of three points, using vectors. See the picture...
 
        
             
        
        
        
So, to do this, all you need to do is add up all the values, and then, with that number, divide by how many values are given. 
150+165+165= 480
480/3= 160
        
                    
             
        
        
        
Your answer is b because the common denominator is 10 and so just look at my pic
        
                    
             
        
        
        
5 seconds 
because that is the positive zero of that equation