Mathematics, 03.08.2019 06:00 Nbeans4962

Acertain 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 35% of the original element remains; the other 65% decayed into lead. how old is the rock? (b). analysis of another rock shows that it contains 55% of it's original element; the other 45% decayed into lead. how old is the rock.

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