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Cool Down Half Gone Again and Again A scientist models the number of grams of...

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Cool Down Half Gone Again and Again A scientist models the number of grams of a radioactive substance with the expression 15 where d is the number of days since the sample was measured 1 After how many days has half of the substance disappeared through radioactive decay Explain your reasoning 2 After 20 days will there be more or less than 1 gram of the substance left Explain your reasoning

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