An artifact was found and tested for its carbon-14 content. If 78% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life ...
... of 5,730 years
It's more of a chemistry question than math or biology.
1 half life: 100% - -> 50%
2nd half life: 50% - -> 25%
2 half lives.
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