can you please explain this question briefly with the help of excel.

Thank You

Quarterly demand for smartphones at a retailer is as shown. Year Quarter Demand 1 513 DI 932 III 1,509 IV 1,902 N 693 II 1.163 III 1,857 IV 2,469 3 846 1,439 THI 2,271 IV 3,079 4 1 1,070 11 1,751 HII 2,785 IV 3,613 1,751 TII 2,105 IV 3,613 Forecast quarterly demand for year 5 using the following models: 1. 4-week simple moving average 2. Simple exponential smoothing with a=0.1 3. Trend adjusted exponential smoothing (Holt's model) with a=0.1 and B=0.1 4. Linear regression with seasonality