Question: The time between high and low tide in a river harbor is approximately 7 h. The high-tide depth of 16 ft occurs at noon and

The time between high and low tide in a river harbor is approximately 7 h. The high-tide depth of 16 ft occurs at noon and the average harbor depth is 11 ft.
a. Write an equation modeling this relationship.
b. If a boat requires a harbor depth of at least 9 ft, find the next two time periods when the boat will not be able to enter the harbor.

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