document.write( "Question 1172771: Please help\r
\n" ); document.write( "\n" ); document.write( "The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 215 grams of a radioactive isotope, how much will be left after 4 half-lives?
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Algebra.Com's Answer #797881 by ikleyn(52805)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "\"215%2F2\"  grams remains after 1-st half-life period\r\n" );
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document.write( "\"215%2F4\"  grams remains after 2-nd half-life period\r\n" );
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document.write( "\"215%2F8\"  grams remains after 3-rd half-life period\r\n" );
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document.write( "\"215%2F16\"  grams remains after 4-th half-life period\r\n" );
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document.write( "Now use your calculator.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Was my explanation clear and useful to you ?\r
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\n" ); document.write( "\n" ); document.write( "To learn more on radioactive decay problems, 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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