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Strontium-90 has a half-life of 28 days. A) A sample has a mass of 75 mg...

Strontium-90 has a half-life of 28 days.

A) A sample has a mass of 75 mg initially. Find a formula for the mass remaining after t days.

B) Find the mass remaining after 40 days.

C) Find the rate of decay equation after t days.

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