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The half-life of bromine-74 is 25 min. How much of a 4.0 mg sample is still active after 75 min? 1.0 mg 0.25 mg 0.50

The half-life of bromine-74 is 25 min. How much of a 4.0 mg sample is still active after 75 min? 1.0 mg 0.25 mg 0.50 mg O4.0 mg 2.0 mg

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