GROWTH OF TABLET AND SMARTPHONE USERS The number of tablets and smartphones in use worldwide (in millions) in year t from 2010 through 2012 can be approximated by f(t) = 128.111.94 (1SI<3) %3D where t = 1 corresponds to 2010. 1. How many tablets and smartphones were in use in 20117 .How fast was the number of tablets and smartphones %3D changing in 2011?

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