A farmer in China discovers a mammal hide that contains 71% of its original of its original amount of C-14, Find the age of the mammal to the nearest year

We can calculate the age by using the formula: final amount=initial amount * (1/2) ^ (time/half-life), or t=ln (final amount/initial amount) / (-0.693) * half-life. The half life of C-14 is 5730 years, and final amount=initial amount is 71% or 0.71, so t=ln (0.71) / (-0.693) * 5730=2832 years approximately.