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sample taken from a layer of mica in a canyon has 2.10 grams of potassium-40. A test reveals it to be 2.6 billion years old. How much
potassium-40 was in the sample originally if the half-life of potassium-40 is 1.3 billion years?
OA. 4.20 g
© B.
8.40 g
O c.
12.6 g
O D.
16.8 g
O E. 25.2 g
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