The depth (D metres) of water in a harbour at a time (t hours) after midnight on a particular day can be modelled by the function D = 4 sin(0.48 t-0.7)+7, t≤ 12, where radians have been used. Select the two options which are correct statements about the predictions based on this model. Select one or more: The model can be used to predict the tide for up to 12 days. The smallest depth is 3 metres. At midday the depth is approximately 3.2 metres. The depth of water in the harbour falls after midnight.

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