document.write( "Question 1162938: At the beginning of an experiment, a scientist has 324 grams of radioactive goo. After 255 minutes, her sample has decayed to 40.5 grams. \n" ); document.write( "

Algebra.Com's Answer #786845 by josgarithmetic(39618) $\"\"$ $\"About$

You can put this solution on YOUR website!
Having a question might be useful. One would assume the situation is exponential decay. You could try using a model like,.... Notice that 40.5 is $\"1%2F8\"$ of 324. If you start with 324, then:
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document.write( "HALVING\r\n" );
document.write( "PERIODS     AMOUNT GOO\r\n" );
document.write( "0            324\r\n" );
document.write( "1            162\r\n" );
document.write( "2             81\r\n" );
document.write( "3             40.5\r\n" );
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\n" ); document.write( "\n" ); document.write( "Maybe you can see how to use this pattern.
\n" ); document.write( "255 minutes is 3 halving periods. \n" ); document.write( "

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