In one day, there are two high tides and two low tides in equally spaced intervals. The high tide is observed to be 6 feet above the average sea level. After 6 hours pass, the low tide occurs at 6 feet below the average sea level. In this task, you will model this occurrence using a trigonometric function by using x as a measurement of time. Assume the first high tide occurs at x = 0.   Part A What are the independent and dependent variables? Part B Determine these key features of the function that models the tide: amplitude period frequency midline vertical shift phase shift Part C Create a trigonometric function that models the ocean tide for a period of 12 hours. Part E What is the height of the tide after 93 hours?

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