Air pollution. The daily level L of carbon monoxide in a city is a function of the number of automobiles in the city. Suppose L (x) = 0.5 2x2 + 4, where x is the number of automobiles (in hundred thousands). Suppose further that the number of automobiles in a given city is growing according to the formula x(t) = 1 + 0.002t2, where t is time in years measured from now.
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