Year 2011 2012 2013 2014 2015 Number of federal credit unions 4486 4315 4153 3976 3812 (a) Find a linear model for these data with x=1 corresponding to the year 2011 (b) Assumming the trend continues,...

(a) Find a linear model for these data with x=1 corresponding to the year 2011

(b) Assumming the trend continues, estimate the number of federal credit unions in the year 2017

The linear model for these data is y=(  )x+(  )