The table below lists the revenue, in billions of dollars, from video rentals in video stores and with subscriptions in recent years.

a) Find linear functions v(x) and s(x) that represent the revenues from video rentals in video stores and with subscriptions x years since 2005.
b) Use the functions found in part (a) to estimate when revenues from video rentals in video stores and with subscription services will be equal.

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Video Rentals in Video Rentals with Video Stores, v(x Subscriptions, s(x) Year, (in billions) (in billions) 2005 2006 2007 2008 2009 $6.1 5.8 4.9 4.3 3.3 $1.4 1.7 2.0 2.1 2.2