Sales a company that produces snowboards forecasts monthly sales over the next two years to be where s is measured in thousands of units and t is the time in months, with t=1 corresponding to January 2017. Predict the sales for each of the following months (A) Feb 2017
(B) Feb 2018
(C) June 2017
(D) June 2018

S= 23.1+0.442t+4.3cos πt/6

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answer is 17