My god, this is tricky but it's between D and E. 
I think  it should be e. 
        
             
        
        
        
Answer: 120 students 
Step-by-step explanation:
multiply 40 by 300 then divide by 100 = 120
 
        
             
        
        
        
It’s the third one I believe try that
        
             
        
        
        
Answer:
6x +3w
Step-by-step explanation:
3(2x + w)
Distribute
3*2x +3*w
6x +3w
 
        
                    
             
        
        
        
Answer:34
Step-by-step explanation:
Weight of Alex:44
Weight of Bob:44*(3/4)
=33
Combined weight of all of them:111
Combined weight of Alex and Bob=44+33=77
Cole's weight=111-77 =34