Suppose a radioactive substance decays according to the equation where
represent the mass in grams after hours. Assume that the half-life of radium is 1600 years. If milligrams of radium are initially present, write the formula for the number of milligrams present after years.
you need to supply some numbers and a formula, doncha think?
I'm sure you can plug in your numbers, since you have the formula, and what it must equal. I mean, you're not in Algebra I any more.