document.write( "Question 1055122: A contractor estimated that 30 ft^3 of cement is required to make a concrete floor that measures 90 ft^2. Using this estimate, find how many additional cubic feet of cement would be required to make a concrete floor that measures 870 ft^2. \n" ); document.write( "

Algebra.Com's Answer #670403 by josmiceli(19441) $\"\"$ $\"About$

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$\"+90+=+k%2A30+\"$
\n" ); document.write( " $\"+k+=+3+\"$
\n" ); document.write( "---------------
\n" ); document.write( "Let $\"+x+\"$ = cubic ft of cement needed
\n" ); document.write( " $\"+870+=+k%2Ax+\"$
\n" ); document.write( " $\"+870+=+3x+\"$
\n" ); document.write( " $\"+x+=+290+\"$
\n" ); document.write( " $\"+290+-+30+=+260+\"$
\n" ); document.write( "260 additional ft3 of cement are needed\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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