help ASAP, please answer using excle and explain and show all work and steps.

Demand for stereo headphones and music players for joggers has caused Nina Industries to grow almost 50 percent over the past year. The number of joggers continues to expand, so Nina expects demand for headsets to also expand, because, as yet, no safety laws have been passed to prevent joggers from wearing them. Demand for the players for last year was as follows: MONTH DEMAND (UNITS) MONTH DEMAND (UNITS) January February March April May June 4,200 4,300 4,000 4,400 5,000 4,700 July August September October November December 5,300 4,900 5,400 5,700 6,300 6,000 a. Using a linear analysis, what would you estimate demand to be for each month of next year? b. Using a linear analysis, what would you estimate if the seasonal effects are not considered