document.write( "Question 87085This question is from textbook College Algebra Math 107
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document.write( ": I am stuck on this problem. Please help. The perimeter of a rectangle is 34 feet and its area is 60 square feet. Find the length and width of the rectangle.\r
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document.write( "Here is what I did:
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document.write( "I used the P = 2l + 2w formula
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document.write( "34 = 2l + 2w.
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document.write( "At this point I'm stuck because I'm not sure how to incorporate the area (60 sq. ft.) into the problem. \n" );
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Algebra.Com's Answer #63052 by tutorcecilia(2152)![]() ![]() You can put this solution on YOUR website! Use the formula for the Area: \n" ); document.write( "Area = (length)(width) \n" ); document.write( "Area = 60 [plug-in the values that are given] \n" ); document.write( "Sovling for either L or W will be too confusing, so... \n" ); document.write( ". \n" ); document.write( "Use the formula for Perimeter: \n" ); document.write( "P=2(length + width) \n" ); document.write( "P=34 [plug-in the values that are given] \n" ); document.write( "34=2(length + width) \n" ); document.write( "34/2=2(length + width)/2 [solve for either the Width or the Length] \n" ); document.write( "17=length + width \n" ); document.write( "17-width=length+width-width \n" ); document.write( "17-width=length \n" ); document.write( "17-W=L \n" ); document.write( ". \n" ); document.write( "Area=(L)(W) \n" ); document.write( "60=(17-W)(W) [plug-in the values and simplify] \n" ); document.write( "60=17W-w^2 [set the equation equal to zero by adding/subtraction from both sides \n" ); document.write( "60-17W+w^2=-17W+17W-W^2+W^2 \n" ); document.write( "60-17W+W^2=0 [re-arrange the terms] \n" ); document.write( "w^2-17W+60=0 [factor] \n" ); document.write( "(W-12)(W-5)=0 [set each factor equal to zero and solve for the W-term] \n" ); document.write( "W-12=0 \n" ); document.write( "W=12 \n" ); document.write( "or \n" ); document.write( "W-5=0 \n" ); document.write( "W=5 \n" ); document.write( ". \n" ); document.write( "Since the width is the smallest of the 5 and 12, let 5=width and let 12 = length.\r \n" ); document.write( "\n" ); document.write( "Check by plugging everything back into both equations. \n" ); document.write( "A=LW \n" ); document.write( "60=(12)(5) \n" ); document.write( "60=60 [checks out] \n" ); document.write( "and \n" ); document.write( "P=2(length + width) \n" ); document.write( "34=2(12+5) \n" ); document.write( "34=2(17) \n" ); document.write( "34=34 [also checks out] \n" ); document.write( " |