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The national cost C in billions of dollars for dental services can be modeled by the linear equation C 2.85n 30.

The national cost C in billions of dollars
for dental services can be modeled by the linear equation
C  2.85n  30.52,
where n is the number of years since 1990 (Health Care
Financing Administration, www.hcfa.gov).
a) Find and interpret the C-intercept for the line.
b) Find and interpret the n-intercept for the line.
c) Graph the line for n ranging from 0 through 20.

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