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.