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A certain element has a half life of 4.5 billion years. a. You find a rock...

A certain element has a half life of 4.5 billion years. a. You find a rock containing a mixture of the element and lead. You determine that 15​% of the original element​ remains; the other 85​% 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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