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A 2009 sample of a radioactive material, mendelevium-265, is placed in a sealed chamber. Three hours later, 1409 of mendelevium-265 remains. To the nearest tenth

A 2009 sample of a radioactive material, mendelevium-265, is placed in a sealed chamber. Three hours later, 1409 of mendelevium-265 remains. To the nearest tenth of an hour, what is the half-life of this material? Select one: 7' a. 5.8 b. 4.2 7' c. 3.4 d. 6.6

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