You are on an archaeological dig and discover a strange artifact. It is a utensil that appears to be carved out of an elephant's tusk. You analyze it and discover that it has 0.625 the amount of carbon-14 you would find in a living specimen. 1. How many half-lives has the specimen been through? (The half-life of carbon-14 is 5,730 years.)
2. How old is the specimen?
3. How much of the present amount of carbon-14 will still be in the artifact in another 11,460 years?