document.write( "Question 364288: The half-life of radium is 1690 years. If 40 grams are present now, how much will be present in 400 years. \n" ); document.write( "

Algebra.Com's Answer #259782 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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The half-life of radium is 1690 years.
\n" ); document.write( "If 40 grams are present now, how much will be present in 400 years.
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\n" ); document.write( "The half-life formula: A = Ao*2^(-t/h)
\n" ); document.write( "where
\n" ); document.write( "A = resulting amt after t yrs
\n" ); document.write( "Ao = initial amt
\n" ); document.write( "h = half-life of substance
\n" ); document.write( "t = time
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\n" ); document.write( "We want to find A:
\n" ); document.write( "A= 40*2^(-400/1690)
\n" ); document.write( "enter on a calc
\n" ); document.write( "A = 33.9477 grams after 400 yrs
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