11.6 because the square root of 135 is 11.61885.... and when you check it is approximately 135 because 11.6 *11.6 = 134.56, which can be rounded to 135
        
             
        
        
        
We can use the same equation to figure out with only substituting the amount he was paid per photo.
Site A    y = $0.85x      =  $0.85(5)  =  $4.25
Site B    y = $0.40x      =  $0.40(5)  =  $2.00
We can see that Jim was paid $2.25 more at site A than Site B.
        
                    
             
        
        
        
The answer is B and C. Hope this helps!