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An isotope of the element erbium has a half-life of approximately 8 hours. Initially there are 15 grams of the isotope present. a. Write the

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An isotope of the element erbium has a half-life of approximately 8 hours. Initially there are 15 grams of the isotope present. a. Write the exponential function that relates the amount of substance remaining, A(t ) measured in grams, as a function of t, measured in hours

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