Tucson Machinery. inc. manufactures numerically controlled machines, which sell for an average price of $0.5 milion each. Sales for these NCMs for the past two years were as follows: Use Exhibit 18.10. a. Find the equation of a simple linear regression line using Excel. (Round your answers to 3 decimal places.) b. Compute trend and seasonal factor from a linear regression line obtained with Excel. (Do not round intermediate calculations. Round your answers to 3 decimal places.) b. Compute trend and seasonal factor from a linear regression line obtained with Excel. (Do not round intermediate calculations. Round your answers to 3 decimal places.) c. Forecast sales for next year using the above seasonai factors. (Do not round intermediate calculations. Round your answers to 2 decimal places.)