document.write( "Question 1179601: The cost (c) of materials for a deck varies jointly with the width (w) and the length (l). If c=$424.80 when w=18 and l=10, find the cost when w=7 and l=22? Be sure to respond in a complete sentence that explains your answer in relation to the question. \n" ); document.write( "

Algebra.Com's Answer #809164 by MathLover1(20849) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( "The cost ( $\"c\"$ ) of materials for a deck varies jointly with the width ( $\"w\"$ ) and the length ( $\"l\"$ ). \r
\n" ); document.write( "\n" ); document.write( " $\"c=k%2Aw%2Al\"$ \r
\n" ); document.write( "\n" ); document.write( "if $\"c=424.80\"$ when $\"w=18\"$ and $\"l=10\"$ , use it to find $\"+k\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"424.80=+k+%2A18+%2A10\"$
\n" ); document.write( " $\"424.80=+k+%2A180\"$
\n" ); document.write( " $\"k=424.80%2F180\"$
\n" ); document.write( " $\"k=2.36\"$ \r
\n" ); document.write( "\n" ); document.write( "so, when $\"k+=+2.36\"$ , $\"w=7\"$ ,and $\"l=22\"$ , the cost would be
\n" ); document.write( " $\"c=2.36%2A7%2A22\"$
\n" ); document.write( " $\"c=363.44\"$ \r
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