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...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...