Question: Fossil dating radioactive beryllium is sometimes used to date fossils found in deep-sea sediment. The amount of radioactive material x satisfies
dx/dt = kx
Suppose that 10 units of beryllium are present in a living organism and that the half-life of beryllium is 4.6 million years. Find the age of a fossil if 20% of the original radioactivity is present when the fossil is discovered.