Van Hien Pham
Calculus I
47. It is estimated that years from now, the circulation of
a local newspaper can be modeled by the formula
C (t) = 100r² + 4001 +50t Int
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a. Find an expression for the rate at which the circu-
lation will be changing with respect to time years
from now.
Van Hien Pham
b. At what rate will the circulation be changing with
respect to time 5 years from now?
c. By how much will the circulation actually change
during the sixth year?