math
posted by jefferson .
In 1980, the population of a certain country was about 161 000. since then the population has decreased about 1% per year.
a. find an equation to model the population since 1980
b. estimate the population in 1990
c. suppose the current trend continues. predict the population 2000.

P(t) = 161000(.99)^t, where t is the number of years since 1980
b) evaluate for t = 10
c) evaluate for t = 20
(time to update your textbook)