The isotope¹ 4C has a half-life of 5,715 years. Given an initial amount of 19 grams of the isotope, how many grams will remain after 1,500 years? After 15,000 years? Round your answers to four decimal places. O 15.8396 gm, 3.0807 gm O 9.5038 gm, 1.8484 gm O 11.0877 gm, 2.1565 gm O 19.0075 gm, 3.6968 gm O 6.3358 gm, 1.2323 gm

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