document.write( "Question 1156769: The isotope Iluvmathium has a half life of 4 years.
\n" ); document.write( "A sample contains 84 units of radioactive Iluvmathium.\r
\n" ); document.write( "\n" ); document.write( "a)Write an exponential function to model the amount of Iluvmathium left, y, after n, half lives.\r
\n" ); document.write( "\n" ); document.write( "b) What amount of Iluvmathium remains after 24 years, to one decimal place?\r
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\n" ); document.write( "\n" ); document.write( "I have the answers and have solved these, Im just unsure if im correct \n" ); document.write( "

Algebra.Com's Answer #779539 by josgarithmetic(39620) $\"\"$ $\"About$

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If you want n half-lives, p initial quantity at any reference time, y the quantity after n half-lives, then $\"y=p%281%2F2%29%5En\"$ , and understand that n=1 is for 4 years.\r
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\n" ); document.write( "\n" ); document.write( "Twenty-four years is 6 half-lives.
\n" ); document.write( "(b):
\n" ); document.write( " $\"y=84%281%2F2%29%5E6\"$ --------compute this. \n" ); document.write( "

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