Use the exponential decay model for carbon-14,
A = A _ { 0 } e ^ { - 0.000121 t }
A=A
0
e
−0.000121t
to solve. Skeletons were found at a construction site in San Francisco in 1989. The skeletons contained 88% of the expected amount of carbon-14 found in a living person. In 1989, how old were the skeletons?
