Bottled Water Sales The following chart shows annual per capita sales of bottled water in the United States for the period 2007-2014.+ Per capita bottled water sales in the U.S. (gallons) 34.6 32.0 30.8 29.0 28.5 276 28.3 29.2 2007 2008 2009 2010 2011 2012 2013 2014 The function R(t) = 0.25t2 - t + 29 gallons (0 st s 7) gives a good approximation, wheret is time in years since 2007. Find the derivative function R'(t). R'(t) = According to the model, how fast were per capita sales of bottled water changing in 2010? Per capita sales of bottled water were increasing at a rate of gallons per year.

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