document.write( "Question 472991: An automatic swing is designed to hold a baby who weighs at least 12 pounds but no more than 20 pounds. If a baby weighs 7.2 pounds at birth and gains 0.2 pounds each week, for what range of weeks will it be safe to put the baby in the swing? Write your answer in interval notation. No spaces! \n" ); document.write( "

Algebra.Com's Answer #324315 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"w\"$ = the week when the baby is 12 pounds
\n" ); document.write( "The formula would be:
\n" ); document.write( " $\"+12+=+.2w+%2B+7.2+\"$
\n" ); document.write( " $\"+.2w+=+12+-+7.2+\"$
\n" ); document.write( " $\"+.2w+=+4.8+\"$
\n" ); document.write( " $\"+w+=+24+\"$
\n" ); document.write( "Let $\"w\"$ = the week when the baby is 20 pounds
\n" ); document.write( " $\"+20+=+.2w+%2B+7.2+\"$
\n" ); document.write( " $\"+.2w+=+12.8+\"$
\n" ); document.write( " $\"+w+=+64+\"$
\n" ); document.write( " $\"+24+%3C+w+%3C+64+\"$ \n" ); document.write( "

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