document.write( "Question 882716: y=70(e^(0.19t)), where t is in hours. use natural logarithms to find the half life of this element \n" ); document.write( "

Algebra.Com's Answer #533030 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
You start with 70.
\n" ); document.write( "When will it be 35?
\n" ); document.write( "You need a negative exponent or else the amount of material increases.
\n" ); document.write( " $\"35=70e%5E%28-0.19t%29\"$
\n" ); document.write( " $\"1%2F2=e%5E%28-0.19t%29\"$
\n" ); document.write( " $\"-0.19t=ln%281%2F2%29\"$
\n" ); document.write( " $\"t=ln%281%2F2%29%2F%28-0.19%29\"$
\n" ); document.write( " $\"t=3.64\"$ hours\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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