2. The curves in the accompanying figure model the birth rates and death rates (in millions of people per year) for a country over a 50-year period. What does the area A between the curves over the interval [1960, 2010] represent? Justify your answer. 2.5 Birth rate 2.0 1.5 1.0 Death rate 0.5 1960 1970 1980 1990 2000 2010 Year Millions/year

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