A company that produces snowboards, which are seasonal projects, forecasts monthly sales for one year to be S = 77.00 + 42.25 cos() where S is the sales in thousands of units and t is the time in months, with t 1 corresponding to January. (a) Use a graphing utility to graph the sales function over the one-year period. 120 100 80 60 40 20 S 120 100 80 60 40 20 2 8 10 12 8 10 12 S 120 100 80 60 40 20 120 88 100 80 60 40 20 10 t 2 10 12 (b) Use the graph in part (a) to determine the months of maximum and minimum sales minimum -Select-