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If only 15% of the carbon-14 remains in a fossilized piece o

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If only 15% of the carbon-14 remains in a fossilized piece of bone, how old is the bone?

A(t)= Aoekt

I am trying to solve this decay problem the o is a subscript and the k and t are superscripts in the equation. The problem is: if only 15% of the carbon-14 remains in a fossilized piece of bone, how old is the bone? (use 5730 years for the half life of carbon-14. I think .15=1e 5730(t) then ln.15 = ln e 5730 (t) but I am not sure what do you think? How would I set this up and solve?

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A(t)= Aoe-kt

If only 15% of the carbon-14 remains in a fossilized piece of bone, how old is the bone? (use 5730 years for the half life of carbon-14. I think .15=1e 5730(t) ...

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