A company aims to forecast the monthly demand for one of its product families. The table below the demand data for the previous months: Month 1 2 3 4 5 6 7 8 9 10 11 12 Demand 390 373 354 342 345 310 295 275 252 243 221 212 a) Use the linear regression model to forecast the demand for the products of this company. Show your work. b) Use your model to forecast the demand for months 10, 30, and 50. Show your work.