# Algebra exam review

*label*Algebra

*timer*Asked: May 15th, 2015

**Question description**

A radioactive material decays over time. The equation below models the situation, where g represents the initial amount of radioactive material. After 3 time periods, there are 12.5 grams of a substance left.

12.5=g(1/2)^3

what was the initial amount of radioactive material?