Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 3 - Solving Inequalities - 3-7 Absolute Value Equations and Inequalities - Practice and Problem-Solving Exercises: 63

Answer

t = 4.444 seconds or t = 17.77 seconds

Work Step by Step

abs(200−18t)=d We want a distance of 120 feet (and also -120 feet, as my friend would still be deemed 120 feet away from me). 200−18t=120 200−18t−120+18t=120−120+18t 80=18t 80/18=18t/18 4.444=t 200−18t=−120 200−18t+120+18t=−120+120+18t 320=18t 320/18=18t/18 17.77=t
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