North American Business Email Users
Year Email Users, m
(million users)
2005 130.7
2006 135.4
2007 138.1
2008 139.6
2009 141.9
2010 144.8
(a) Determine the linear model for number of North American business email users given number of years x since 2005.
m(x) = million users is number of North American business email users x years after 2005. 0 = x = 5
(b)Determine constant rate of change of number of North American business email users?
(c) Use model to find number of North American business email users in 2011.
Is given estimate found by interpolation or extrapolation?