APFIVE Rate of Change of NO₂ Concentration
In studying photochemical smog, a city’s nitrogen dioxide concentration is modeled by the function $$C(t)=30*(1-e^{-0.2*t})$$ (in ppm), where t is hours after 9 AM. What is the instantaneous rate of change of the NO₂ concentration at t = 4 hours?
A
Approximately 4.80 ppm/hour
B
Approximately 1.20 ppm/hour
C
Approximately 2.70 ppm/hour
D
Approximately 3.20 ppm/hour
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