Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 2 - Solving Equations - 2-5 Literal Equations and Formulas - Practice and Problem-Solving Exercises - Page 112: 31


7 cm

Work Step by Step

The perimeter of a rectangle is found by adding all the sides together. We can use the formula P=2(length)+2(width) to do so. Let w equal the width of the rectangle since we are given the perimeter and length of the rectangle. Plug in your given values into the equation, giving you: 84= 2(35) + 2w Multiply the 2 and the 35 on the right side of the equation to get: 84=70 + 2w Next, subtract 70 from both sides to get: 14=2w Lastly, divide both sides by 2 to get w by itself. 7=w This gives us our answer of 7 cm.
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