Answer:
6 Hours and 20 minutes 
Step-by-step explanation:
 
        
                    
             
        
        
        
10^[ 12 - ( - 3 ) ] = 10^( 12 + 3 ) = 10^15 ;
We use the formula 
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Answer:
Which school do you attend please and which grade are you in please
 
        
             
        
        
        
Answer:
x + 138 = x + 138
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
30 I think but I'm probably wrong