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College algebra

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The radioactive element has a half-life of about 28 years and sometimes contaminates the soil. After 47 years, what percentage of a sample of the elements remain?

  • College algebra -

    fraction remain = (1/2)^n where n is the number of half life

    half life = p/n where p is the period of decaying i.e. 47 years

    so, first find n (number of half life using the half life equation and then find the fraction remain. convert this fraction to %

    hope that helps

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