Answer:
-2.3
Step-by-step explanation:
 
        
             
        
        
        
To convert km/s to m/min, multiply by 1000*60=60000
hence 0.85km/s=51000 m/min
        
             
        
        
        
Total commission that Lamar got is:
6.5/100×785,000
=$51,025
Amount that Lamar split with his broker:
40/100×51025
=$20410
Amount that brokerage split
=50/100×20410
$10205
Total amount Lamar received $10205
        
                    
             
        
        
        
S - 4
s minus 4 is the answer. s is the number and this is 4 fewer than s. Hope this helps.