At first glance this seems like a rather stupid question. Thus problems in calculus books read like number 11 on page 535 of Calculus, Concepts and Contexts by James Stewart.
Scientists can determine the age of ancient objects by a method called radiocarbon dating .
Vegetation absorbs carbon dioxide through the atmosphere and animal life assimilates 14 C through food chains. When a plant or animal dies it stops replacing its carbon and the amount of 14 C begins to decrease through radioactive decay. Therefore, the level of radioactivity must also decay exponentially. Estimate the age of the parchment. Ce -kt , where C is another positive constant, the amount of 14 C in the material when it was harvested and made into parchment, and t is the number of years since this event took place.