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OpenStudy (anonymous):
The water level varies from 12 inches at low tide to 52 inches at high tides.Low tide occurs at 9:15am and high tide occurs at 3:30pm. What is a cosine function that models the variation in inches above and below the water level as a function of times in hours since 9:15 am?
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OpenStudy (anonymous):
If you give me the answer to number 18, I can help you with this one.
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