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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anonymous · Answer

I'm think i'm on this test now, but I'm on number 7.

anonymous · Answer

I only have two left and this one and the other one are the ones im struggling with most.

anonymous · Answer

What is the other one that you are having trouble with?