The figure shows the depth of water at the end of a boat dock. The depth is 8 feet at low tide and 16 feet at high tide. On a certain​ day, low tide occurs at 6 AM and high tide at noon. If y represents the depth of the water x hours after​ midnight, use a cosine function of the form y=AcosBx+D to model the​ water's depth.   Write the equation for this problem in the form y=AcosBx+D.

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