Answer:
Option C
Step-by-step explanation:
Option c is right answer 
 
        
                    
             
        
        
        
15 is compostit bevuasw (3x5=15) (1x15)
        
                    
             
        
        
        
3.5 since its asking how many he has, he has 3.5 its not askint how many bags he needs or how much a bag holds
        
                    
             
        
        
        
Answer:
10k.
Step-by-step explanation:
1) if for the 1st position can be used 0-9 digits (10 digits), for the 2d - 0-9 digits, for the 3d - 0-9 digits and for the 4th - 0-9 digits, then
2) the required number of pwd is: 10*10*10*10=10⁴=10000.