(1 point) Scientists can determine the age of ancient objects by the method of radiometric dating. The bombardment of the upper atmosphere by cosmic rays converts nitrogen to a radioactive isotope of carbon, carbon-14, with a half-life of about 5730 years. Vegetation absorbs carbon dioxide through the atmosphere and animal life assimilates carbon-14 through food chains. When a plant or animal dies, it stops replacing its carbon and the amount of carbon-14 begins to decrease through radioactive decay. Therefore the level of radioactivity must also decay exponentially.

A discovery revealed a parchment fragment that had about 83% as much carbon-14 radioactivity as does plant material on the earth today. Estimate the age of the parchment.

Parchment is approximately ....years old