can anyone help with this question

A time series from t = 0 to 85 is being considered. The observations at times 83, 84, and 85 are given, along with some of their single and double exponential smoothed estimates, calculated with w = 0.7: Time (t) 83 84 85 yt 67.3 66.8 66.5 Single smoothed estimate 68.1 Double smoothed estimate 69.9 All forecasts should be rounded to one decimal place and the trend should be rounded to three decimal places. Calculate the predicted value of yes using double exponential smoothing with w = 0.7. a. Cannot be calculated, the single smoothed estimate at t = 84 is not provided. O b. 65.8 c. 64.3 O d. 67.8 De. 68.6