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The depth of water in a harbour varies as a function of time. The

maximum depth is 9 feet and the minimum depth is 1 foot. The depth can be modelled with a sinusoidal function that has a period of 12 hours. If the depth is 5 feet at 12 midnight and is increasing, 

a. Create algebraic model to predict the depth of the water as a function of time. Justify your reasoning. [T4] [C2]

b. The water must be at least 7 feet for Annie's fishing boat to safely navigate the harbour. She wants to enter the harbour during the afternoon.

 i. Create graph of this function using technology. [T2]

 ii. What is the earliest time she can enter the harbour? [T2]

 iii. How long can she safely stay in the harbour? [T2]

I only need help with question B ii. and B iii.

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Subject: Math, Trigonometry

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