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Uranium-238 (U-238) has a half-life of 4.5 billion years. Geologists find a rock containing a mixture of U-238 and lead, and determine that 81% of

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Uranium-238 (U-238) has a half-life of 4.5 billion years. Geologists find a rock containing a mixture of U-238 and lead, and determine that 81% of the original U-238 remains, the other 19% has decayed into lead. How old is the rock? The rock is 1.368 billion years old. (Round to three decimal places as needed.)

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