document.write( "Question 1118294: Find the dimensions (radius and height) that give the minimum cost for producing cylindrically shaped aluminum cans with lids and a volume of 16pi in^3. How much would it cost to produce 100,000 cans if aluminum price is 0.03 cents/in^2? \n" ); document.write( "
Algebra.Com's Answer #733573 by josgarithmetic(39618)\"\" \"About 
You can put this solution on YOUR website!
Look for minimum AREA for the minimum cost.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "h, height
\n" ); document.write( "r, radius
\n" ); document.write( "A, area\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"system%28h%2Api%2Ar%5E2=16pi%2CA=2%2Api%2Ar%5E2%2Bh%2A2pi%2Ar%29\"\r
\n" ); document.write( "\n" ); document.write( "-\r
\n" ); document.write( "\n" ); document.write( "\"hr%5E2=16\"\r
\n" ); document.write( "\n" ); document.write( "\"h=16%2Fr%5E2\"\r
\n" ); document.write( "\n" ); document.write( "-\r
\n" ); document.write( "\n" ); document.write( "\"A=2pi%2Ar%5E2%2B%2816%2Fr%5E2%29%282pi%2Ar%29\"
\n" ); document.write( "\"A=2pi%2Ar%5E2%2B32pi%2Fr\"------------------(technology is showing minimum at about r=2)\r
\n" ); document.write( "\n" ); document.write( "\"dA%2Fdr=4pi%2Ar%2B%2832pi%29%28-1%29%28r%5E%28-2%29%29\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"dA%2Fdr=4pi%2Ar-32pi%2Fr%5E2\"
\n" ); document.write( "\"common_denominator_r%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"dA%2Fdr=%284pir%5E3-32pi%29%2Fr%5E2\"\r
\n" ); document.write( "\n" ); document.write( "Need the NUMERATOR to be 0.\r
\n" ); document.write( "\n" ); document.write( "\"4pi%2Ar%5E3-32pi=0\"\r
\n" ); document.write( "\n" ); document.write( "\"4pi%2Ar%5E3=32pi\"\r
\n" ); document.write( "\n" ); document.write( "\"r%5E3=8\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight%28r=2%29\"
\n" ); document.write( ".\r
\n" ); document.write( "\n" ); document.write( "With this r value found for minimum A, the value for h, minimum A, can be evaluated, and also the corresponding cost.
\n" ); document.write( "
\n" );