need help please with the one which is not correct c-1

The following table contains the demand from the last 10 months: a. Calculate the single exponential smoothing forecast for these data using an a of 0.10 and an initial forecast (F) of 33 , (Round your answers to 2 decimal places.) Answer is complete and correct. b. Calculate the exponential smoothing with trend forecast for these data using an a of 0.10,a of 0.20 , an initial trend forecast (T) of 1.00, and an initial exponentially smoothed forecast ( F$ of 32 . (Round your answers to 2 decimal places.) Answer is complete and correct. c-1. Calculate the mean absolute deviation (MAD) for the last nine months of forecasts. (Round your answers to 2 decimal places.) Answer is complete but not entirely correct. c-2. Which is best? Single exponential smoothing forecast Exponential smoothing with trend forecast