Please show all steps and explain

Problem 4.2a The following table shows the actual demand observed over the last 11 years: 1 2 3 4 5 6 9 11 Year Demand 7 12 8 13 10 13 6 8 5 7 12 9 9 7 This exercise contains only parts b, c, and d. b) Using the 3-year moving average, provide the forecast from periods 4 through 12 (round your responses to one decimal place). Year 4 5 6 7 8 9 10 11 12 Forecast Problem 4.59 Question Help Sales of tablet computers at Ted Glickman's electronics store in Washington, D.C., over the past 10 weeks are shown in the table below: 1 3 4 5 6 7 8 9 10 Week Demand 2 21 21 27 36 25 28 37 24 26 30 a) The forecast for weeks 2 through 10 using exponential smoothing with a = 0.50 and a week 1 initial forecast of 21.0 are (round your responses to two decimal places): 4 5 6 Week 1 Demand 21 Forecast 21.0 2 21 3 27 7 37 25 8 24 9 26 10 30 36 28