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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,

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.

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

I know the earliest time she can stay at the harbour is 1am but I need help on how to find how long she can stay until.

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Subject: Math, Trigonometry

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