I have a math test on the chapter on Tuesday, and my teacher handed out the pre-test on Thursday. There are a few problems I am totally stumped on, and figured the math geniuses here could give me some help. Some I can get somewhere with, some I don't know where to begin.(adsbygoogle = window.adsbygoogle || []).push({});

Here is one problem I am stuck on:

At CI State Park, the average height of the tide in feetthours after hight tide is given by the function

[tex]h(t)=2\cos\left(\frac{2\pi}{13}\left(t-2\right)\right)+4[/tex]

a. What is the smallest positive value of t corresponding to the low tide?

The answer to a is 8:30. How did they come up with this answer?

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# Homework Help: Pre-Test on Trigonometric Equations and Applications

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