So there are 8 counters out of 20 which are yellow. so that is 8/20 which is simplified to 2/5
so the answer is 2/5
        
                    
             
        
        
        
A) 6
Replace the y with 6
4(6)+13=37
Multiply 
24+13=37
Add
37=37
I hope this helps :)
If you have any questions about my answer please feel free to ask:)
        
                    
             
        
        
        
It have more energy picking up more particles in less time 
        
             
        
        
        
The answer is negative 149