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April 17, 2014

Homework Help: Calculus

Posted by Z32 on Tuesday, October 6, 2009 at 8:08pm.

[Exponential growth & decay]

The half-life of radioactive strontium-90 is approximately 29 years. In 1965, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 14 percent of the original amount absorbed remains?

time= ____ years

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