The amount of carbon-14 still present in a sample after t years is given by the function

where C0 is the initial amount. Estimate the age of a sample of wood discovered by an archeologist if the carbon level in the sample is only 18% of its original carbon-14 level.

1 answer

I did one for you. Now you do this one.
By the way you left the half life of carbon 14 or exponential decay function out of your statement of the problem making it impossible without looking that up.