If Qo is the quantity of radioactive carbon-14 in an organism at the time of death, the quantity, Q. remaining t years later is given by Q = Qoe^-0.0001211

(a) A skull uncovered at an archeological dig has 16% of the original amount of carbon-14 present. Estimate its age.
Round your answer to the nearest integer.

(b) Calculate the half-life of the carbon-14. Round your answer to the nearest interger.