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7. Please find the solution. Thanks!

Algebra
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Apr 20th, 2015

14.524. b^1690=1/2; b=(1/2)^(1/1690); b^780=(1/2)^(780/1690); b^780=.7262 is the proportion left after 780 years. multiplying by 20 gets the final answer.

Apr 20th, 2015

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