document.write( "Question 1166002: Iodine - 131 is a radioactive isotope used in medicine. Its half-life or decay rate of 50% is 8 day. If a patiend is given 25mg of iodine - 131, how much would be left after 32 days or half-lives. Identify C,t,r, and the decay factor. Write down the equation you would use and solve. \n" ); document.write( "
Algebra.Com's Answer #790472 by ikleyn(52915)\"\" \"About 
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document.write( "32 days are 4 half-life periods.\r\n" );
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document.write( "Therefore, the final amount of the medicine after 32 days will be\r\n" );
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document.write( "    \"%281%2F2%29%5E4%2A25\" = \"25%2F16\" = \"1\" \"9%2F16\" mg.    ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "Notice that the instructions to the solution in the post go across the educational purpose of the problem.\r
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\n" ); document.write( "\n" ); document.write( "It is why I did not follow these instructions.\r
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\n" ); document.write( "\n" ); document.write( "To learn more on the subject, look into the lesson\r
\n" ); document.write( "\n" ); document.write( "    - Radioactive decay problems \r
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\n" ); document.write( "\n" ); document.write( "Also,  you have this free of charge online textbook in ALGEBRA-I in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lesson is the part of this online textbook under the topic \"Logarithms\".\r
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\n" ); document.write( "\n" ); document.write( "Save the link to this online textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-I
\n" ); document.write( "https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "to your archive and use it when it is needed.\r
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