College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter P, Prerequisites - Section P.9 - Modeling with Equations - P.9 Exercises: 43

Answer

4 inches

Work Step by Step

We know that the perimeter is 2*length+2*width. We use the image for guidance and the given fact that the perimeter is 102: $102=2(20+2x)+2(15+2x)$ We solve for $x$: $102=40+4x+30+4x$ $102=70+8x$ $32=8x$ $x=4$ So the width of the strip is 4 inches.
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