Answer
313 cars
Work Step by Step
They should try to wash 313 cars because you cannot wash a fraction of a car to get exactly 400 dollars. So you round to the next whole number to get slightly more than 400 dollars.
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 1 - Linear Functions - 1.1 Solving Linear Equations - 1.1 Exercises - Page 15: 89
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