Answer:

round off to 3s.f
means change to when you have 3 useful numbers
7613.83 has 4numbers.2decimal
same must be the round off value 
 
        
                    
             
        
        
        
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Answer:
maya - 6 min per puzzle
amy - 7 min per puzzle
maya would finish first since her unit rate is smaller. for example, it takes maya 30 for 5 but it would take 35 for 5.
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
$23.52
Step-by-step explanation:
So first you would have to find how much each one would be if you were buying one individual book.  For that you would do 31.36/4 to get $7.84.  Then since you found that for only 1 book, you would need to multiply that by 3 to get $23.52
 
        
                    
             
        
        
        
-4x +4 = -3x + 31
4 - 31 = -3x + 4x
 -27 = x