Step-by-step explanation:
Hi there!
To find slope you use the change of y over change of x formula. You first need to ordered pairs to plug into the equation.
Formula: 
(Y1-Y2)/(X1-X2)
 
        
                    
             
        
        
        
6, 7, 8, and 9. just plug the X into the equation
        
             
        
        
        
M represents the month because the value is decreasing every month.
Hope this helps :)
        
                    
             
        
        
        
Since theres 4 numbers and 60 spins if you divide it you get the average number that all the numbers would land on. 2 would be landed on 15 times if it went exactly to the calculations. not 100% sure though