One important method of dating fossil remains is to determine what portion of carbon content of a fossil is the radioactive isotopecarbon-14. During life, any organism exchanges carbon with its environment. Upon death this circulation ceases, and the carbon-14in the organism then decays at a rate proportional to the amount present. The proportionality factor is 0.012% per year. When didan animal die, if an archaeologist determines that only 25% of the original amount of carbon-14 is still present in its fossil remain?(A) 11,550 yearsB 11,000 yearsC) 11,000 yearsD12,500 years

Given: Proportionality factor is 0.012 % Remaining of original amount is 25%

Answered: plogist determines that only 25% of the…

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plogist determines that only 25% of the a

Algebra: Structure And Method, Book 1

(REV)00th Edition

ISBN:9780395977224

Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Chapter12: Quadratic Functions

Section12.8: Joint And Combined Variation

Problem 9P

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Question

One important method of dating fossil remains is to determine what portion of carbon content of a fossil is the radioactive isotope
carbon-14. During life, any organism exchanges carbon with its environment. Upon death this circulation ceases, and the carbon-14
in the organism then decays at a rate proportional to the amount present. The proportionality factor is 0.012% per year. When did
an animal die, if an archaeologist determines that only 25% of the original amount of carbon-14 is still present in its fossil remain?
(A) 11,550 years
B 11,000 years
C) 11,000 years
D
12,500 years

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