Given: y = A cos(Bx âˆ’ C) + D. Throughout the day the depth of water at the end of a pier varies with the tides. High tide occurs at 4:00 a.m. with a depth of 6 meters. Low tide occurs at 10:00 a.m. with a depth of 2 meters.
1. Model the problem by using the given trigonometric equation to show the depth of the water t hours after midnight, showing all your work.
2. Solve the problem by finding the depth of the water at noon, explaining your reasoning.
3. A large boat needs at least 4 meters of water to secure it at the end of the pier.
a. Determine what span of time after noon, including both a starting and ending time, the boat can first safely be secured, justifying your answer.
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