test tomorrow need to review, im answering a reviwer, and I can't figure out the...

B

Beezlezzz

New member
...formula, help!? Carbon- 14 has half life of 5730 years, How old is a wooden object if 70% of the 14^C has decayed?

a) 2948 yr
b) 1280 yr
c) 9950 yr
d) 4321 yr

i tried the solution 5730 x 0.70 and it turned out to be "4011" but it isn't on the choices... i dont know whats wrong and the right solution,

thanks for helping!
 
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