Strontium-90 has a half-life of 28 days. (a) A sample has initial mass of 50 mg. Find a formula for the mass remaining after t days, y(t). y(t) 50 -2 (*)- (b) Find the mass (in mg) remaining after 15 days. (Round your answer to one decimal place.) 34.5 mg (c) How long does it take (in days) the sample to decay to a mass of 2 mg? (Round your answer to the nearest day.) 130 days

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