Spending in America has been decreasing. The rate of spending of an average American household can be modeled by the function A'(t) = V 250 - 1.8t2, where t is the number years since 2000 and 0 S t $ 10, and A' is thousands of dollars per year. Using 100 left endpoint rectangles and Microsoft Excel, we will calculate the area under the curve between the years 2004 to 2008. (Round your answers to three decimal places as needed.) (a) Using the Microsoft Excel spreadsheet, complete the first two non-heading rows. A B n dx ith rect xi f(xi) Ai 4 8 100 0.04 4 14.873 0.595 2 4.04 14.853 0.594 (b) Determine the area under the curve from 2004 to 2008. Enter a number. (c) Interpret the meaning of the answer in part (c) in the context of this problem. Between the years 2004 and 2008, the total spending of an average American household was thousand dollars