Answer:
 they send electrical signals to the buzzer. The buzzer changes those electrical signals into sound. You hear the buzzer sound and know that someone is calling you.
Explanation:
 
        
                    
             
        
        
        
Ether get a new headset or take out the plug blow on it or wipe it or clean the inside of the computer where the headset wire goes
        
             
        
        
        
Answer:
Bitmap images can contain any number of colors but there are four main categories: Line-art. These are images that only contain two colors, usually black and white.
 
        
             
        
        
        
Answer:
There are various ways: Handing out papers/fliers to people, or presenting slides. 
 
        
             
        
        
        
Answer:
well, as long as there are no right or wrong answers, don't:
look to closely at the screen, as it may mess up your eyes
hold a drink above the computer, as it may spill and cause "sticky keys"
go to sites that you know will give your a computer a virus, cause they cost hundreds of dollars to repair, and some aren't able to come out
go on illegal sites/do illegal operations to the computer itself, because then you won't have a computer
Explanation: