In Colorado, sales of medical marijuana began in November 2012; however, the Department of Revenue did not report tax collection data until February of 2014. The accompanying table shows a portion of the monthly revenue from medical and retail marijuana tax and fee collections as posted in the Colorado state accounting system.

Use the linear trend model (no seasonality) to forecast the tax revenue for November and December of 2018.  

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Date Feb-14 Mar-14 A Oct-18 Revenue 3,519,756 4,092,575 22,589,679