An environmental study of a certain suburban community suggests that t years from now the average le


Question: An environmental study of a certain suburban community suggests that \(t\) years from now the average level of carbon monoxide in the air will be

\[Q(t)=0.15{{t}^{2}}+1.2t+2.6\text{ parts per million}\]

a) At what rate the will carbon monoxide level be changing with respect to time four years from now? Is the level of carbon monoxide increasing or decreasing?

b) What is the net increase from year 3 to year 4?

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