I believe it is the commutative property of multiplication. Commutative property is you can put the numbers in any order and it will have the same end result. I got multiplication because it is multiplication. 
Hope this helps!
 
        
                    
             
        
        
        
Answer:
the area of a square with a side length of 9x  
Step-by-step explanation:
 
        
             
        
        
        
5.2 x 10-2 and 5.2 x 10-1
        
                    
             
        
        
        
It's an expression that can be simplified to read
       ( 0.7  x  0.4 ) ( b³  x  b⁹ )
   =  (      0.28    )  (    b¹²      )  =  0.28 b¹² .