halflife
posted by bubb .
ok so i got...
the half life of carbon14 is 5730 years, the relation c+(1/2)^ N/5730 is used to calc. the concentration, c, in parts per trillion remaining n years after death determine the carbon concentration in a 11460 year old bone.
please help :)

You must be kidding. No capitals to begin the sentence and no periods at the end of a sentence. I can't find the question. But I can tell it's a halflife question.
I don't use your formula. I used a revised version which always gives the same result.
Calculate k. k = 0.693/t_{1/2}
Then substitute k into the following.
ln(No/N) = kt
k is from above.
No is what you started with. I would assume a value of 1
N is what is left.
t is the time in the problem.
Post your work in readable form if you get stuck. 
qwone