can someone please help me solve this? could you please include step by step how you got the answer i do not know how to start this problem. thank you

Sales of tablet computers at Ted Glickman's electronics store in Washington, DC, over the past 10 weeks are shown in the table below 4 6 Week 1 2 3 5 7 8 9 10 Demand 21 23 27 38 26 28 37 22 25 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) Week 5 8 10 Demand 21 27 38 26 28 37 22 25 Forecast 210 D 1 3 4 6 7 2 23 30