Annual retail store revenue for Apple from 2007 to 2017 are shown below (investorapple website). 

a. Construct a time series plot. What type of pattern exists in the data? 

b. Using statistical software, develop a linear trend equation for this time series. 

c. Use the trend equation developed in part (b) to forecast retail store revenue for 2018.

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Retail Store Revenue Year Period ($ billions) 2007 1 $4.115 2008 $6.310 2009 3 $6.577 2010 4 $9.080 2011 5 $14.127 2012 6 $18.828 2013 7 $20.228 2014 $21.462 2015 9 $28.109 2016 10 $27.198 2017 11 $30.503