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Air Pollution Nitrogen dioxide is a brown gas that impairs breathing. The amount of nitrogen dioxide present in the atmosphere on a certain May day in the city of Long Beach measured in PSI (pollutant standard index) at time t, where t is measured in hours and t = 0 corresponds to 7 a.m., is approximated by
Find the time of the day when the amount of nitrogen dioxide is greater than or equal to 128 PSI.
Source: Los Angeles Times.
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