Answer:
13(4+x)
=52+13x
Step-by-step explanation:
13 multiplies the 4 and x.
then 13 multiply 4 is 52 while 13 multiply x 13x.
 
        
             
        
        
        
Answer:
The 4th system (h = 4.2 − p
; h = 2p)
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
168 hours or 10080 minutes or 604800 seconds
Step-by-step explanation:
7days * 24 hours = 168 hours
168 hours * 60 minutes = 10080 minutes
10080 minutes * 60 seconds = 604800 seconds