Hello, please may I get some help :)!

QUESTION 4 [66] Consider the sales data presented in the previous question and assume that the initial smoothed level corresponds to the first observation. (4.1} Use the simple exponential smoothing with a: = 0.25 to determine the smoothed levels corre- sponding to the data. (16] (4.2] Compute the forecasts made last period. (8] (4.3] Compute the forecast errors. (8} (4.5) Using the Holt's trend corrected exponential smoothing, compute the smoothing levels and growth rates at each time point of the data. Use a = 0.25 and y = 0.1. (34)