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OpenStudy (anonymous):
in 1.2 years ,half of 64mg of radioactive isotopes decays.the amount present after 6 years is a]0mg b]8mg c]6mg d]2mg
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OpenStudy (xishem):
How many 1.2 years are in 6 years? Every 1.2 years, the substance will lose half of its amount.
OpenStudy (nincompoop):
do the math, @asmagul even with crude addition or subtraction you can answer this
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