Enter the exponential decay function described in the situation and answer the question asked. You may find using a graphing calculator helpful in solving this problem.
Carbon-14 is a radioactive isotope of carbon that is used to date fossils. There are about 1.5
atoms of carbon-14 for every trillion atoms of carbon in the atmosphere, which known as
1.5 ppt (parts per trillion). Carbon in a living organism has the same concentration as
carbon-14. When an organism dies, the carbon-14 content decays at a rate of 11.4% per
millennium (1,000 years). Write the equation for carbon-14 concentration (in ppt) as a
function of time (in millennia) and determine how old a fossil must be that has a measured
concentration of 0.3 ppt. Round your answer to two decimal places.