The answer may be A look man im just here for the points
        
             
        
        
        
Answer:
List the features of the computer 
 
        
             
        
        
        
Pressure tightness and squeezing
        
                    
             
        
        
        
Answer:
mechanical waves
Explanation:
They require a medium to travel through. 
 
        
                    
             
        
        
        
C 1650 Because you have to factor in the difference of BC and AD. you must get 1200 BC to 0 first, and then go to 450, therefore getting 1650