document.write( "Question 1027858: Please, help me with this
\n" ); document.write( "If each sides of a cube expands by r%. What is the approximate percentage change in its volume?
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Algebra.Com's Answer #643144 by Fombitz(32388)\"\" \"About 
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So assume that the side was originally, \"S\".
\n" ); document.write( "Now it would be \"S%2Br%2F100\"
\n" ); document.write( "The volume originally was
\n" ); document.write( "\"V%5B1%5D=S%5E3\"
\n" ); document.write( "and the new volume,
\n" ); document.write( "\"V%5B2%5D=%28S%2Br%2F100%29%5E3\"}
\n" ); document.write( "\"V%5B2%5D=S%5E3%2B%283%2F100%29S%5E2r%2B%283%2F10000%29Sr%5E2%2B%281%2F1000000%29r%5E3\"
\n" ); document.write( "We can approximate by chopping off the last two terms,
\n" ); document.write( "\"V%5B2a%5D=S%5E3%2B%283%2F100%29S%5E2r\"
\n" ); document.write( "So then comparing,
\n" ); document.write( "\"V%5B2a%5D%2FV%5B1%5D=%28S%5E3%2B%283%2F100%29S%5E2r%29%2FS%5E3\"
\n" ); document.write( "\"V%5B2a%5D%2FV%5B1%5D=1%2B%283%2F100%29%28r%2FS%29\"
\n" ); document.write( "Multiply by 100 to make it a percentage,
\n" ); document.write( "\"V%5B2a%5D%2FV%5B1%5D=100%2B3%28r%2FS%29\"
\n" ); document.write( "Subtract 100 to find the percentage change,
\n" ); document.write( "\"PC=3%28r%2FS%29\"\r
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