The half-life for thorium-227 is 18.72 days. The amount A (in grams) of thorium-239 after t...

 

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The half-life for thorium-227 is 18.72 days. The amount A (in grams) of thorium-239 after t years for a 10- gram sample is given by A(t) = 10-0.5 How long will it take before 7 grams of thorium-227 is left in the sample? Round your answer to the hundredths place. days The half-life for thorium-227 is 18.72 days. The amount A (in grams) of thorium-239 after t years for a 10- gram sample is given by A(t) = 10-0.5 How long will it take before 7 grams of thorium-227 is left in the sample? Round your answer to the hundredths place. days