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Solve the following questions given below:

Question I: A radioactive isotope has an activity of 8.57 mCi. After 3.25 hours the activity is 6.08 mCi. What is the half-life of the isotope?

Question II: What is the activity after an additional 3.25 hours in mCi units?

Please use as much detail as possible in answer, thank you.

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