document.write( "Question 865609: what would x be is the surface area is 864 cm2 and height is 12 cm and length is 16 cm \n" ); document.write( "

Algebra.Com's Answer #521779 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "Surface = 2(12*16) + 2(12x) + 2(21x) = 664cm^2
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document.write( "                     2(12x) + 2(21x)  = 664-384
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document.write( "                                66x = 280
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document.write( "                                  x = 4.24
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