Google it.  ('>')...................................................
        
             
        
        
        
Missing part of the question
Determine the number of handshakes, i, that will occur for each number of people, n, in a particular room. (people)
Answer:

Step-by-step explanation:
Given
For 5 people

Using the given instance of 5 people, the number of handshakes can be represented as:

The above sequence is an arithmetic sequence and the total number of handshakes is the sum of n terms of the sequence.

Where
 --- The first term
 --- The last term
So:


 
        
             
        
        
        
Multiply 3x by -6, it gives you -18 so I'm going to say D
        
                    
             
        
        
        
? I’m confused is there supposed to be a picture to this? I don’t see a expression so..
        
             
        
        
        
The difference between the two is: Your Mom!