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log(4+6)^(3)+1 Calcium -47 is used for scanning bones for suspected disorders. If 53 grams of a 250 or calcium -47 sample is left after 30

log(4+6)^(3)+1 Calcium -47 is used for scanning bones for suspected disorders. If 53 grams of a 250 or calcium -47 sample is left after 30 hours, what is the half-life

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