1. Carbon-14 is a radioactive isotope used to date the age of plants and animals. it has a half-life of about 5730 years. while a plant or animal is alive the amount of carbon-14 present is constant, but when the plant or animal dies the amount of carbon-14 begins to decay. To determine the length of time since the plant or animal died, you measure the percent of carbon-14 remaining and apply the decay function. 
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3. Use your function to calculate the percentage of carbon 14 remaining after 100 years. 1000 years?