document.write( "Question 886228: The edge of a cube. is 80cm long .How its volume and surface area i change if the egde is decreased by 10%? \n" ); document.write( "

Algebra.Com's Answer #535772 by JulietG(1812) $\"\"$ $\"About$

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The volume of a cube is found by $\"s%5E3\"$
\n" ); document.write( "The volume of a cube with an 80cm long side is equal to $\"80%5E3\"$ . 80 x 80 x 80 = 512000
\n" ); document.write( "If you decrease its side by 10%, you now have a cube with a 72cm side.
\n" ); document.write( " $\"72%5E3\"$ , or 72 x 72 x 72 = 373248 cubic cm
\n" ); document.write( "By decreasing the side, you have decreased the volume by 512000-373248=138752, or 27.1%
\n" ); document.write( ".
\n" ); document.write( "The surface area of a cube is found by $\"6s%5E2\"$
\n" ); document.write( "The surface area of a cube with an 80cm side is equal to 6* $\"80%5E2\"$ , or 6*6400, or 38400 sq cm.
\n" ); document.write( "If you decrease its side by 10%, it becomes 6* $\"72%5E2\"$ , or 6*5184, or 31104.
\n" ); document.write( "The decrease is 7296, which is 19%.
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