An isotope of sodium has a half-life of 20 hours. Suppose an initial sample of this isotope has mass 10 grams. Which expression gives the amount of the isotope (in grams) remaining after t hours? (Note: We're assuming exponential decay here. Use the exponential decay function.) A. 10(1.035 264924)* B. 10(965936329)* C. 20(1.071773462)t

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