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The amount of carbon-14 present in a tree is given by the formula C(t)=C0e−.00012t, where C0...

The amount of carbon-14 present in a tree is given by the formula C(t)=C0e−.00012t, where C0 is the amount of carbon-14 present in it at the time of its death and t is the number of years that have elapsed since it died. If the plant has 15% of its original carbon-14, how old is it?

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