The table shows the number of people in North America who use email as a part of their jobs. North American Business Email Users Year Email Users, m (million users) 2005 127.2 2006 133.1 2007 136.2 2008 142.5 2009 147.7 2010 149.2 Find a linear model for the number of North American business email users given the number of years x since 2005. (Round all numerical values to three decimal places.) m(x) = What is the constant rate of change of the number of North American business email users? (Round your answer to three decimal places.) Use the unrounded model to estimate the number of North American business email users in 2018. (Round your answer to three decimal places.)

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