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: 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: $456677$ Maroon $5$ TV Appearances Demand for Guitars $3576117$ This exercise contains only parts b$,$ c$,$ and d$.$ b$)$ Using the least$-$squares regression method, the equation for forecasting is $($round your responses to four decimal places$)$: Y$=[]+[$x Y $+$ IX