Carbon 14 is a radioactive isotope that decays at a rate proportional to the amount present and has a half-life of 5,730 years. If the original amount present of carbon 14 were 10 grams, how much would be left after 1,000 years?

Answer:
8.861 grams
Step-by-step explanation:
X = 10 × ½^(t/5730)
At t = 1000
X = 10 × (½)^(1000/5730)
X = 8.860622295 grams