The continuous annual rate of decay for carbon-14 is 0.0121 %.
a. Write a function that gives the percentage of carbon-14 remaining after t years.
b. If a fossil is 6500 years old. how much carbon-14 remains? Round your answer to the nearest whole percent.
c. If an ancient skull is found to have 31% of its carbon-14 remaining, how old is the skull? Give both the exact value and its four-decimal-place approximation.
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