Mark Gershon, owner of a musical instrument distributorship, thinks that demand for guitars may be related to the number of television appearances by the popular group Maroon 5 during the previous month. Gershon has collected the data shown in the following table D Maroon 5 TV Appearances Demand for Guitars This exercise contains only parts b, c, and d. 4 3 3 8 576 685 116 b) Using the least-squares regression method, the equation for forecasting is (round your responses to four decimal places):