The Amount of Nitrogen Dioxide, a Brown Gas That Impairs

Short Answer

The amount of nitrogen dioxide, a brown gas that impairs breathing, present in the atmosphere on a certain May day in a city has been approximated by
​ ​
where ​A​(​t) is measured in pollutant standard index (PSI), and t is measured in hours, with corresponding to 5
a.m. Use the trapezoidal rule with to estimate the average PSI between 5
a.m. and noon. Please round the answer to the nearest hundredth.