Mathematics, 04.08.2019 00:10 ajsoccer1705

The half-life of a radioactive substance is 14 days. after 4 days a sample of the substance has been reduced to a mass of 4 mg.
what was the initial mass in mg) of the sample?
round your answer to 2 decimal places as need.
using your answer from above, after how many days will there only be 0.5 mg of substance left?
round your answer to 2 decimal places as needed.

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