7. The cost of manufacturing x cases of cereal is C dollars, where C = 3x + 4Vx + 2. Weekly production at t weeks from the present is estimated to be x = 6200 + 100t cases. a.) Find the marginal cost, dx' woltJost 0002o 6 36 19 do otenl to gldenonel dc b.) Find the time rate of change of cost, dt' 0 xlo d enalae orlt neriwemir arls26 poned an e oevado amo onarzib ond astwoH (O narlw am c.) How fast (with respect to time) are costs rising whent = 2?

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