√5 (10-4√2)
=10√5-4√10
The answer is D
        
                    
             
        
        
        
Answer:0.4813042802
Step-by-step explanation:
 
        
             
        
        
        
If there are 8 marbles in a group , and 5 out of every 8 is red, than in six groups there would be 5, 10, 15, 20, 25, 30 red marbles. 
This lists the group of 6 sets.
30 red marbles in 6 sets.