Posted by **Anonymous** on Wednesday, July 10, 2013 at 8:53pm.

The radioactive element polonium decays according to the law given below where Q0 is the initial amount and the time t is measured in days.

Q(t) = Q0 · 2-(t/140)

If the amount of polonium left after 700 days is 45 mg, what was the initial amount present?

mg

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