U.S. Federal Debt Based on data from the U.S. Treasury Department, the federal debt (in trillions of dollars) for the years 1995 to 2004 was given approximately by the formula
D(x) = 4.95 + .402x − .1067x2 + .0124x3 − .00024x4.
where x is the number of years elapsed since the end of 1995. Estimate the federal debt at the end of 1999 (x = 4) and the rate at which it was increasing at that time.
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