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Strontium-90 has a half-life of 28 days. A sample has a mass of 60 mg initially. Find the mass remaining after 35 days. O a)

Strontium-90 has a half-life of 28 days. A sample has a mass of 60 mg initially. Find the mass remaining after 35 days. O a) 25.23 mg 0 b) 31.23 mg O c) 27.23 mg 0 d) 33.23 mg O e) 29.23 mg

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