Question

Radium disintegrates at a rate proportional to the amount present. If 100 mg are set aside now, 96 mg will be left 100 years hence. Find how much will be left t centuries from the time the radium was set aside. Determine the amount left after 2.56 centuries and the half-life of radium.

Answer 1

I'm confused in how to find c from the equation \[x = ce ^{kt}\]