Let's pick one person at random and call it the 'first'.
That person shakes hands with 29 other classmates.
Take another person different from the first, we'll call him the 'second'. Since he has already shaken hands with the first, he shakes hands with 28 other classmates.
The 'third' person will likewise shake hands with 27 other classmates, and so on.
Hence, the total number of handshakes is 29+28+27+...+2+1 = 29*30/2=435 handshakes
        
                    
             
        
        
        
Mistake D. The response from seniors was reversed.
        
             
        
        
        
Answer:
9,765,625
Step-by-step explanation:
 
        
             
        
        
        
Step-by-step explanation:
Alternate and corresponding angles.
 
        
                    
             
        
        
        
PEMDAS
multiply 2x2=4 and simplify the equation by looking for like terms to combine.
4+16x+y+34=0
4 and 34 are like terms so add them. 
the simplified expression is 16x+y+38