Question

from 1970 to 1990, the average cost (C) of a
new car(in dollars)can be approximated by the model C=33.4t^2+4309 where (t) is the year, with t=0 corresponding to 1970.During which year was the average cost of a new car $15,000?

Answer 1

set up the problem with 15000 for C and solve for t
\[15000=33.4t ^{2}+4309\]

Answer 2

ok thanksss
:))