Question: After t weeks, a factory is producing N(t) thousand DVD players, where At what rate is the production level changing after 4 weeks? Is production

After t weeks, a factory is producing N(t) thousand DVD players, where


N(t) 21 t + 3t + 12


At what rate is the production level changing after 4 weeks? Is production increasing or decreasing at this time?

N(t) 21 t + 3t + 12

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