Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 1 - Section 1.7 - Exponents and Order of Operations - Exercise Set: 85

Answer

12

Work Step by Step

$72-\{18-[40\div(5\times1)+2]+52\}$ $\longrightarrow$ first resolve the innermost group, the parenthesis = $72-\{18-[40\div5+2]+52\}$ $\longrightarrow$ resolve the innermost group, now the brackets, divide then add as specified by the order of operations = $72-\{18-[8+2]+52\}$ $\longrightarrow$ add within the brackets = $72-\{18-10+52\}$ $\longrightarrow$ subtract then add within the braces, working left to right = $72-\{8+52\}$ $\longrightarrow$ add = $72-60$ $\longrightarrow$ subtract =$12$
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