Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 4 - Section 4.6 - Graphs of Other Trigonometric Functions - Exercise Set - Page 612: 100


$12$ crossings, $96$ dollars

Work Step by Step

Step 1. Assume $x$ crossings are needed. Step 2. Without the pass, the cost is $8x$ Step 3. With the pass, the cost is $36+5x$ Step 4. Letting $8x=36+5x$, we have $3x=36$ and $x=12$ and a total cost of $8(12)=96$ dollars per month for both.
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