# Algebra

posted by
**Tamie**
.

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

represents