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OpenStudy (anonymous):
If a radioactive nuclide has a half-life of 1.3 billion years and it is determined that a rock contains 25% of its original amount of this nuclide, about how old is the rock? 1.3 billion years 2.6 billion years 0.65 billion years 3.9 billion years
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OpenStudy (anonymous):
@HELP!!!! @thedude1001 @dan815
OpenStudy (anonymous):
@zepdrix @Kainui @KlOwNlOvE @HELP!!!! @159507nb
OpenStudy (anonymous):
@KlOwNlOvE help me
OpenStudy (anonymous_user):
1.3 billions years.
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