Answer:
8
Step-by-step explanation:
Substitute the equation and values into the average rate of change formula.
 
        
             
        
        
        
Explanation is in the file
tinyurl.com/wpazsebu
 
        
             
        
        
        
2/3-> 4/6
1/2-> 3/6
Subtract 
1/6
2/5-> 16/40
1/8-> 5/40
Subtract 
11/40
        
             
        
        
        
Answer: neather do i add picture
Step-by-step explanation: