..... .... .............. ............... The values y (in billions of dollars) of U.S. currency in circulation in the years 2000 through 2007 can be modeled by y = -451 + 444 In t, 10 sts 17, where t represents the year, witht = 10 corresponding to 2000.t During which year did the value of U.S. currency in circulation exceed $800 billion?

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