4a13. Can someone show me how to do this problem? steps with explanations please

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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: Week 1 2 3 4 5 6 7 8 9 10 Demand 19 20 28 38 25 28 37 24 25 29 a) The forecast for weeks 2 through 10 using exponential smoothing with a = 0.50 and a week 1 initial forecast of 19.0 are (round your responses to two decimal places): 1 2 3 4 6 7 8 9 10 Week Demand 5 25 19 20 28 38 28 37 24 25 29 Forecast 19.0 b) For the forecast developed using exponential smoothing (a = 0.50 and initial forecast 19.0), the MAD = sales (round your response to two decimal places). c) For the forecast developed using exponential smoothing (a = 0.50 and initial forecast 19.0), the tracking signal = (round your response to two decimal places)