Radioactive isotopes can be used to find the age of rocks, fossils, or other artifacts. Carbon-14 has a half-life of 5,730 years. Suppose a sample of charcoal from a primitive fire pit contains one eighth of its original amount of carbon-14. How old is the sample? A. 716 years B. 17,190 years C. 22,920 years D. 45,840 years Not math I know....but nobodys active in the chem or physics room!!!!!!! .

Question

Radioactive isotopes can be used to find the age of rocks, fossils, or other artifacts. Carbon-14 has a half-life of 5,730 years. Suppose a sample of charcoal from a primitive fire pit contains one eighth of its original amount of carbon-14. How old is the sample?
 A. 716 years
 B. 17,190 years
 C. 22,920 years
 D. 45,840 years

Not math I know....but nobodys active in the chem or physics room!!!!!!! >.< 
really appreciate the help :) Also please explain your answer ^_^

anonymous · Answer

its maths

anonymous · Answer

nothing is math, or had you forgotten :P

answer's b right yall?

anonymous · Answer

B

anonymous · Answer

$$\frac{1}{8}=\frac{1}{2^3}$$
This means we have had 3 half-lifes.  Each half-life is 5730 years, so we simply multiply by 3. 
B is right.

anonymous · Answer

There are 3 half lives so just multiply 5730 by 3

rosey · Answer

so deff not got ur email in my inbox lol

anonymous · Answer

Awwwwwwwwwww >.<
Are you serious!!??!!
poisoniv1996@hotmail.com 
copy and paste!!
it's EXACTLY that lol