Rate of Change of NO₂ Concentration
The concentration of nitrogen dioxide (NO₂), in parts per million (ppm), in a city is modeled by the function , where $t$ is the number of hours after 9:00 a.m. What is the instantaneous rate of change of the NO₂ concentration at $t = 4$ hours?
A
Approximately 2.70 ppm/hour
B
Approximately 1.20 ppm/hour
C
Approximately 3.20 ppm/hour
D
Approximately 4.80 ppm/hour
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