Be sure to answer all parts. A freshly isolated sample of Y was found to have an activity of 5.8 x 10° disintegrations per minute at 1:00 p.m. on December 3, 2006. At 2:15 p.m. on December 17, 2006, its activity was measured again and found to be 1.5 × 10* disintegrations per minute. Calculate the half-life of "Y. Enter your answer in scientific notation.

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