document.write( "Question 65737: Hi. \r
\n" ); document.write( "\n" ); document.write( "\"The population P of a certain culture is expected tp be given by a model P=100e^rt where r is a constant to be determined and t is a number of days since the original population of 100 was established. I need to find the value of r if the population is expected to reach 200 in 3 days.\"
\n" ); document.write( "

Algebra.Com's Answer #46452 by funmath(2933)\"\" \"About 
You can put this solution on YOUR website!
\"The population P of a certain culture is expected tp be given by a model P=100e^rt where r is a constant to be determined and t is a number of days since the original population of 100 was established. I need to find the value of r if the population is expected to reach 200 in 3 days.\"
\n" ); document.write( "P=200
\n" ); document.write( "t=3
\n" ); document.write( "\"200=100e%5E%28r%2A3%29\"
\n" ); document.write( "\"200%2F100=100e%5E%283r%29%2F100\"
\n" ); document.write( "\"2=e%5E%283r%29\" Take the natural log of both sides
\n" ); document.write( "\"ln%282%29=ln%28e%5E%283r%29%29\" remember: ln(a^m)=mln(a)
\n" ); document.write( "\"ln%282%29=3rln%28e%29\"
\n" ); document.write( "\"ln%282%29=3r%281%29\" remember: ln(e)=1
\n" ); document.write( "\"ln%282%29=3r\"
\n" ); document.write( "\"ln%282%29%2F3=3r%2F3\"
\n" ); document.write( "\"r=ln%282%29%2F3\"
\n" ); document.write( "\"r=.6931471806%2F3\"
\n" ); document.write( "\"r=.2310490602\" Round off to whatever you are asked for.
\n" ); document.write( "Happy Calculating!!!
\n" ); document.write( "
\n" );