If someone can show work on how to do this, I am not understanding how to do this.

4. The data below provides weekly sales for the past 18 weeks (weeks 8-25). # Week 8 9 10 11 12 13 14 15 16 Sales 4,000 3,655 3,908 3,483 3,538 3,121 3,092 3.221 2,859 3.037 2.946 2.675 2.238 2.733 2,670 2.680 2,200 2.350 17 18 19 20 21 22 23 24 25 (2 pts.) a) Use a three period weighted moving average with weights of 0.6.0.3 and 0.20 to forecast the week 26 sales. Forecast of sales for week 26 = (4 pts.) b) What is the linear regression equation for forecasting, and what is the R2 value? Equation: RE (3 pts.) c) Use linear regression to make a forecast for week 26 and for week 36. Forecast of sales for week 26 Forecast of sales for week 36 (2 pts). What about this data above will make a linear regression forecast generally greater than a weighted moving average forecast