The cost of manufacturing x cases of fillfluff is C dollars (in thousands), where C(x) = 4 x + 4 sqrt(x) + 5 Monthly production at t weeks is expected to be x = 6400 + 90 t Write an equation to express rate of change of cost with respect to time: (dC)/(dt) = i found equation to express manufacturing cost as a function of time: C(t) =25600+360t+4sqrt(6400+90t)+5 and the equation to express marginal cost: (dC)/(dx) =4+2/sqrt(x)

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