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A formula to calculate how old a sample is by carbon-14 dating is:

t = [ ln (Nf/No) / (-0.693) ] x t1/2

where ln is the natural logarithm,

Nf/No is the percent of carbon-14 in the sample compared to the amount in living tissue

t1/2 is the half-life of carbon-14 (5,700 years).

Is that right?