function word problem

Question

According to data about movie ticket prices, between 2000 and 2014 the average cost of a movie ticket in a given year was
C(t) = 5.40 + 0.21t dollars.
Here t is the time in years since 2000.
(a)
Explain in practical terms the meaning of
C(9).

Answer 1

C(9) would be the cost of a ticket in 2009.

 

C(9) = 5.40 + 0.21(9)

 

Apparently, a ticket cost $5.40 in 2000 and the price goes up by an average of 21 cents per year.