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The average weekly sales for a clothing store between 2004 and 2008 are given below

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The average weekly sales for a clothing store between 2004 and 2008 are given below. Average Weekly Sales for a Clothing Store Thousand Year Dollars 2004 38.84 53.55 63.8 2005 2006 2007 2008 72.16 68.17 6.17

(a) What behavior suggested by a scatter plot of the data indicates that a quadratic model is appropriate?  a single concavity with no change in direction no concavities a single concavity with a change in direction two concavities with no change in direction

(b) Align the input so that t= 0 in 2000. Find a function for quadratic model for the data that gives the average weekly sales for the clothing store in thousand dollars, with data from 4sts 8. (Round all numerical values to three decimal places.) s(t) =

(c) Numerically estimate the derivative of the model from part (b) in 2007 to the nearest hundred dollars. per year

(d) Interpret the answer to part (c). In 2007, the average weekly sales for the clothing store were ---Select-- by $ per year.