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SOLVED:The level of ozone, an invisible gas that irritates and impairs breathing, present in the atmosphere on a certain May day in the city of Riverside was approximated by A(t)=1.0974 t^3-0.0915 t^4 (0 ≤t ≤11) where A(t) is measured in pollutant standard index (PSI) and t is measured in hours, with t=0 corresponding to 7 a.m. Use the second derivative test to show that the function A has a relative maximum at approximately t=9. Interpret your results.
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