1. You find a skull in a nearby tribe ancient burial site and with the help of a spectrometer, you discovered that the skull contains 9% of the C-14 found in a modern skull. Assuming that the half-life of C-14 (radiocarbon) is 5,730 years, how old is the skull?
2. Suppose that the population of a colony of bacteria increases exponentially. At the start of an experiment, there are 10,000 bacteria, and one hour later, the population has increased to 10,500. How long will it take for the population to reach 25,000? Round off your answer to the nearest hour.
