document.write( "Question 32191This question is from textbook Elementray and Intermediate Algebra
\n" ); document.write( ": Suppose that a certain radioactive substance has a half-life of 50 years. If there are presently 7500 grams of the substance, how much will remain after 32 years? Express your answer to the nearest gram.\r
\n" ); document.write( "\n" ); document.write( "Please help me solve this equation. \n" ); document.write( "
Algebra.Com's Answer #18722 by Fermat(136)\"\" \"About 
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The equation to use is,
\n" ); document.write( "M=Mo.2^(-t/T)
\n" ); document.write( "where
\n" ); document.write( "Mo is the original mass
\n" ); document.write( "T is the half-life period
\n" ); document.write( "t is the time since the start of measuring
\n" ); document.write( "M is the mass at time t
\n" ); document.write( "You have,
\n" ); document.write( "Mo = 7500 gms
\n" ); document.write( "T = 50 yrs
\n" ); document.write( "t = 32 yrs
\n" ); document.write( "M = ?
\n" ); document.write( "Using the half-life eqn,
\n" ); document.write( "M = 7500*2^(-32/50)
\n" ); document.write( "M = 7500*2^(-0.64)
\n" ); document.write( "M = 7500*0.641713
\n" ); document.write( "M = 4812.85
\n" ); document.write( "M = 4813 gms
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