Navigation According to a report recently issued by the Army Corps of Engineers, on a particular day the function
where t is in hours, t = 0 corresponds to 2:00 A.M., and d(t) is in feet, may be used to predict the height of the Cape Fear river at one point near its mouth. If your boat needs at least a river height of 5 feet, find the first time interval in which it is unsafe for you to navigate that part of the river.
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