Calculus: Early Transcendentals (2nd Edition)

Published by Pearson
ISBN 10: 0321947347
ISBN 13: 978-0-32194-734-5

Chapter 1 - Functions - 1.2 Representing Functions - 1.2 Exercises: 21

Answer

If 0≤t≤60: $c(t) = 0.05t$ If 60
1487521601

Work Step by Step

From 8 to 9 P.M, the cost of the cost per minute is 5 cents or 0.05 dollars. 9 PM. is 60 minutes after 8P.M, so if 0≤t≤60 the function $c(t) = 0.05t$ is appropriate. Now after 9 P.M, the price changes to 3 cents or 0.03 dollars. Notice the question asks states the price changes after 9P.M. That means 9 P.M, or 60 minutes after 8 P.M is not included in the second piece of the function. For this reason we say If 60.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.