The amount of nitrogen dioxide, a brown gas that impairs breathing, present in the atmosphere on a certain May day in the city of Long Beach is approximated by A(t) = where A(t) is measured in pollutant standard index (PSI) and t is measured in hours, with t = 0 corresponding to 7 a.m. Find the intervals where A is increasing and where A is decreasing. (Enter your answers using interval notation.) increasing decreasing 136 1+0.25(t-4.5) Interpret your results. + 28 (0 sts 11)