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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

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 40% of the original element remains; the other 60% decayed into lead. How old is the rock?

b. Analysis of another rock shows that it contains 15% of its original element; the other 85% decayed into lead. How old is the rock?

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