Radioactive Decay The half-life of palladium-100 is 4 days. After 20 days a sample has been reduced to a mass of 0.375 g. (a) What was the initial mass of the sample? (b) Find a function that models the mass remaining after 1 days. (c) What is the mass after 3 days? (d) After how many days will only 0.15 g remain?

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