Intermediate Algebra (6th Edition)

$\approx636$ bears
Exponential decay can be modeled by the function $y=C(1-r)^{x}$ (where C is the initial amount present, r is the decay rate, and x is the number of time intervals measured). In this case, we are wanting to measure the amount of bears left after 6 years, so $x=6$. We are given that the decay rate is .11 and there are 1280 bears originally present. $y=1280(1-.11)^{6}=1280(.497)\approx636$ bears