A) the radioactive element carbon-14 has a half-life of 5750 years. the percentage of carbon-14 present in the remains of plants and animals can be used to determine age. how old is a skeleton that has lost 48% of its carbon-14?
note: do not round any numbers during your calculation.
b) find the present value of $5 due 9 years later at 6.1%, compounded continuously.
c) a radioactive substance has a decay rate of 2.4% per year. what is its half life? give your answer correct to 2 decimal places.