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The total amount spent by some number of people on clothing and footwear in the...

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The total amount spent by some number of people on clothing and footwear in the years 2000-2009 can be modeled by the quadratic function f(x) = -4.867x + 72.73x +97.86, where x = 0 represents January2000, x= 1 represents January 1, 2001, and so on, and f(x) is in billions of dollars. According to the model, in what year during this period was the amount spent on clothing and footwear a maximum?

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