Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 1 - Equations and Inequalities - 1.2 Applications and Modeling with Linear Equations - 1.2 Exercises: 2


$d=20$ miles

Work Step by Step

RECALL: For situations involving time (t) , distance (d) and rate (r, sometimes referred to as speed), the formula for distance is: $d=rt$ The given situation has: $r=80$ mph $t =15$ minutes = $\dfrac{1}{4}$ hour Use the formula above to obtain: $d=rt \\d=80(\frac{1}{4})$ $\\d=20$ miles
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