The cost of producing x units of particular commodity is πΆ(π₯) = 1 3 π₯ 2 + 4π₯ + 53 dollars, and the production level t hours into a particular production run is π₯(π‘) = 0.2π‘ 2 + 0.03π‘ units. At what rate is cost changing with respect to time after 4 hours
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