The half-life of a radioactive kind of europium is 15 years. If you start with 90,624 grams of it, how much will be left after 75 years?

The change in water level of a lake is modeled by a polynomial function, w(x). described how to find the x-intercepts of w(x) and how to construct a rough graph of w(x) so that the parks department can predict when there will be no chage in the water level. you may create a sample polynomial of degree 3 or higher to use in your explanations.