You are at a archeological dig an discover a strange artifact. It is a utinsil tha 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 woul find in a living specimen. How many half lives has the specimen been through? How old is the specimen? How much of the present amount of carbon - 14 will be in the artifact in another 11,460 years?