ECONOMICS: National Debt The national debt (the amount of money that the federal government has borrowed from and therefore owes to the public) is approximately billion dollars, where x is the number of years since 2010. The population of the United States is approximately P(x) = 2.73x + 309 million.
a. Enter these functions into your calculator as y1 and y2, respectively, and define y3 to be y1 ÷ y2, the national debt divided by the population, so that y3 is the per capita national debt, in thousands of dollars (since it is billions divided by millions). Evaluate y3 at 5 and at 10 to find the per capita national debt in the years 2015 and 2020. This is the amount that the government would owe each of its citizens if the debt were divided equally among them.
b. Use the numerical derivative operation NDERIV to find the derivative of y3 at 5 and at 10 and interpret your answers.
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