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Mathematics

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A certain element has a half life of 2.5 billion years. a. You find a rock containing a mixture of the element and lead. You determine that 20% of the original element remains; the other 80 % decayed into lead. How old is the rock? b. Analysis of another rock shows that it contains 65% of its original element; the other 35% decayed into lead. How old is the rock?

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mcastroag000 mcastroag000

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The answer is 234

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