document.write( "Question 1113664: The cost C of steel tubing is jointly proportional to its length L​, in​ feet, and diameter D​, in inches. If a 2 foot tube with a 3 inch diameter costs ​$12​, find the cost of a 6 foot tube with a diameter of 6 inches.\r
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Algebra.Com's Answer #728744 by josgarithmetic(39620)\"\" \"About 
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\n" ); document.write( "The cost C of steel tubing is jointly proportional to its length L​, in​ feet, and diameter D​, in inches.
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\n" ); document.write( "\n" ); document.write( "\"C=k%2ALD\"\r
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\n" ); document.write( "\n" ); document.write( "\"k=C%2F%28LD%29\"\r
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\n" ); document.write( "If a 2 foot tube with a 3 inch diameter costs ​$12​,...
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\n" ); document.write( "\n" ); document.write( "\"k=12%2F%282%2A3%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"k=2\"\r
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\n" ); document.write( "\n" ); document.write( "-\r
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\n" ); document.write( "\n" ); document.write( "\"highlight_green%28C=2%2ALD%29\"
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