Annual sales of bottled water in the U.S. in the period 2000-2010 can be approximated by the function R(t) = -45t +900t +4200 million dollars, where t is time in years since 2000. According to the model, were annual sales of bottled water accelerating or decelerating in 2009? How fast? C In 2009, annual sales of bottled water were accelerating O decelerating by million dollars per year.

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