4a13. Can someone show me how to do this problem? Don't forget the last part c

Will rate a thumb up for good response thank you (circle or highlight answers thx)

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): Week 1 2 3 4 5 6 7 8 9 10 Demand 19 20 28 38 25 28 37 24 25 29 Forecast 19.0 19.00 19.50 23.75 30.88 27.94 27.97 32.48 28.24 26.62 b) For the forecast developed using exponential smoothing (a = 0.50 and initial forecast 19.0), the MAD = 5.28 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)