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The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 109 yr.A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms.The age of the rock is
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Fractions
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Higher Terms
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Denominator
In a fraction, the number below the line.
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