document.write( "Question 1157954: A radioactive isotope, selenium, used in the creation of medical images of the pancreas,
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Algebra.Com's Answer #780883 by ikleyn(52792) $\"\"$ $\"About$

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document.write( "The general formula is\r\n" );
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document.write( "    M = ,\r\n" );
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document.write( "where  M0  is the initial mass;  M is the current (remaining) mass, and \"t\" is time in days.\r\n" );
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document.write( "So, the answers (and the calculation work) are\r\n" );
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document.write( "    M = 100*((1/2)^(20/119.77)) = 89.07 grams.      ANSWER\r\n" );
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