Answer
See below.
Work Step by Step
Let $x$ be the number of thousands of miles driven. Then the depth is: $8-0.12x$.
So when the depth is $2$, then: $2=8-0.12x\\6=0.12x\\x=50$.
Thus it will be like that after $50$ thousand miles.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 2 Linear Equations and Functions - Chapter Test - Page 145: 25
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