Answer
02/18/15.
Work Step by Step
To run a good marathon, one needs to be good physically; the worst day would mean the lowest physical condition, and we can identify that day as 02/18/15.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.5 - Graphs of Sine and Cosine Functions - Exercise Set - Page 597: 78
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