The average cost (in dollars) incurred by a media company each week in pressing x compact discs is given by the following equation. C(x) = −0.0003x + 3 + 3000/x        (0 < x ≤ 6000) Show that  C(x)  is always decreasing over the interval (0, 6000). Find  C'(x). C'(x) =

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