document.write( "Question 1111150: A compute manufacturer finds that when x millions of dollars are spent on research, the profit, P(x), in millions of dollars is given by P(x)=20+5log base 3 (x+3). How much should be spent on research to make a profit of 40 million dollars? \n" ); document.write( "
Algebra.Com's Answer #726199 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "\"+P%28x%29=20%2B5log+%283%2Cx%2B3%29\"\r
\n" ); document.write( "\n" ); document.write( "if \"P%28x%29=+40\"(million dollars)\r
\n" ); document.write( "\n" ); document.write( "\"40+=20%2B5log+%283%2Cx%2B3%29\"\r
\n" ); document.write( "\n" ); document.write( "\"5log+%283%2Cx%2B3%29=40+-20\"\r
\n" ); document.write( "\n" ); document.write( "\"5log+%283%2Cx%2B3%29=20\"\r
\n" ); document.write( "\n" ); document.write( "\"log+%283%2Cx%2B3%29=20%2F5\"\r
\n" ); document.write( "\n" ); document.write( "\"log+%283%2Cx%2B3%29=4\"\r
\n" ); document.write( "\n" ); document.write( "\"log+%28x%2B3%29%2Flog%283%29=74\"\r
\n" ); document.write( "\n" ); document.write( "\"log+%28x%2B3%29=4%2Alog%283%29\"\r
\n" ); document.write( "\n" ); document.write( "\"log+%28x%2B3%29=log%283%5E4%29\"\r
\n" ); document.write( "\n" ); document.write( "\"x%2B3=3%5E4\"\r
\n" ); document.write( "\n" ); document.write( "\"x=81-3\"\r
\n" ); document.write( "\n" ); document.write( "\"x=78\" millions\r
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