document.write( "Question 1027690: A rectangular prism has sides that are in the ratio of 3:5:9. If the volume of the prism is 8640 cm2, then the surface area of the prism, in square millimetres, is... \n" ); document.write( "
Algebra.Com's Answer #802014 by CubeyThePenguin(3113)\"\" \"About 
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(3x)(5x)(9x) = 8640
\n" ); document.write( "135x^3 = 8640
\n" ); document.write( "x^3 = 64\r
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\n" ); document.write( "\n" ); document.write( "x = \"4\"\r
\n" ); document.write( "\n" ); document.write( "sides: 12, 20, 36\r
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\n" ); document.write( "\n" ); document.write( "surface area: 2(12 * 20 + 12 * 36 + 20 * 36) = 2,784 cm^2 = 278,400 mm^2
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