The table shows the number of people in North America who use email as a part of their jobs North American Business Email Users Email Users, m (million users) Year 2005 125.2 2006 131.1 133.8 2007 2008 137.9 139.8 2009 144.1 2010 (a) 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)= million users is the number of North American business email users x years after 2005. 0 s x S 5 (b) What is the constant rate of change of the number of North American business email users? (Round your answer to three decimal places.) million users per year (c) Use the model to estimate the number of North American business email users in 2012. (Round your answer to three decimal places.) million users Is this estimate found by interpolation or extrapolation? interpolation Oextrapolation

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