zachbater zachbater

07-12-2016
Mathematics

contestada

If 60% of a radioactive element remains radioactive after 400 million years, then what percent remains radioactive after 500 million years? What is the half-life of this element?

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MRDUFFMAN17 MRDUFFMAN17

07-12-2016

Son this is too hard and I am a professor in a University.

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