Prealgebra (7th Edition)

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

Chapter 3 - Review: 94

Answer

The roadway miles in South Dakota is 82,354 miles. The roadway miles in North Dakota is 86,843 miles.

Work Step by Step

Let $s$ be the roadway miles in South Dakota. The roadway miles in North Dakota is $s+4489$. $s+s+4489=169197$ $\longrightarrow$combine like terms $2s+4489=169197$ $\longrightarrow$addition property $2s+4489-4489=169197-4489$ $\longrightarrow$combine like terms $2s=164708$ $\longrightarrow$multiplication property $2s\div2=164708\div2$ $\longrightarrow$divide $s=82354$ $s+4489=82354+4489=86843$
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