The half-life of an element is 8 days. If you start with 80g of the sample, how much will be left after 64 days?

Match the following items. 1. queen isabella of spain paid for him to sail west to reach the far east equator 2. largest ocean hemisphere 3. ocean around the north pole mir 4. russian space station vasco da gama 5. imaginary line around the middle of the earth pacific 6. first to sail from portugal, around africa, to india arctic 7. florida, a piece of land almost surrounded by water spice islands 8. an imaginary line through the earth around which the earth turns columbus 9. half of sphere peninsula 10. europeans 500 years ago wanted to find an all-water route to this place axis