Question: This is an Applied Math class, and I do not have any idea what formula to use to figure this out, please guide me. Gold

This is an Applied Math class, and I do not have any idea what formula to use to figure this out, please guide me.

Gold (Au) has a synthetic isotope that is relatively unstable. After 25.5 minutes, a 128-gram sample has decayed to 2 g. So, What is the half-life of this isotope?

Possible Responses could be, but it is only 1.

2.25 minutes

8.5 minutes

1.5 minutes

4.25 minutes

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