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The cumulative number of AIDS cases C in the United States from 1982 to 1994 can be modeled by C = 3200x2 + 1586, and the cumulative number of AIDS deaths D from 1982 to 1994 can be modeled by D = 1900x2 + 619. In these equations x = 0 corresponds to 1982, x = 1 corresponds to 1983, and so on until x = 12 corresponds
to 1994.* (Source: U.S. Department of Health.)
(a) Write the rational expression DC
in terms of x.
(b) Evaluate your expression for x = 4, 7, and 10.
Round your answers to the nearest thousandth.
Interpret the results.
(c) Explain what the rational expression DC

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