Question

The Twisted River had approximately
5,300 Chinook salmon in 2008. The
population has been decreasing at a
rate of 8% per year. Write a function
that gives the population in terms of y
years after 2008.

Answer 1

each year p(y) = .92 p(y-1)
when y = 0, p = 5300
when y = 1, p = .92 * 5300
when y = 2, p = .92*.92 * 5300
when y = n, p = .92^n * 5300

think compound negative interest :)


p = .92^y * 5300

Answer 2

I don't get it... how did u get .92?