1.67 is your answer 13.98 - 3.96=10.02 10.02 divided by 6 = 1.67
Hope I helped
        
             
        
        
        
 What is the context for the question if there is any?
        
                    
             
        
        
        
C. f(x) = – 2 cos 6x + 1
Start by determining the amplitude. Since we've deduced the amplitude is 2, the equation can include either a positive or negative 2 (since amplitude measures absolute value).
Next is the period. The equation for period P is P = (2pi)/b. If P is pi/3, then 
pi/3 = (2pi)/b. Thus your b value should be 6. 
Finally, the midline would be given by + 1 since adding a unit shifts the function upwards. This means that instead of the highest y value being 2 and the lowest -2, instead you'd have values of 3 and -1. 
(3 – 1)/2 = 1 (midpoint theory).
        
                    
             
        
        
        
Since 0 isn't above 5 it will stay the same, So 2096 to the nearest thousand will be 2000