<PRE><B>Question 1029934</B>
: The total amount spent by Americans on shoes and clothing from 2000 to 2009 can be modeled by

f(x)= -49.79x2+71.73x+97.29 
where x=0 represents year 2000 and f(x) is in billions of dollars. Based om this model, in what year did spending on shoes and clothing reach a maximum?
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Max occurs when x = -b/(2a) = -71.73/(2*-49.79)  is less than one.
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I think you did not post your problem correctly.
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Cheers,
Stan H.
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