Not sure what to do here.. How fast are costs rising with respect to time when t

Question

Not sure what to do here..

How fast are costs rising with respect to time when t = 2?

The cost of manufacturing x cases of fill fluff is C dollars (in thousands), where C(x) = 7x + 2 x + 7 Monthly production at t weeks is expected to be x = 5000 + 90t Write an equation to express manufacturing cost as a function of time: C(t) Write an equation to express marginal cost: dC/dx Write an equation to express rate of change of cost with respect to time: dC/dt How fast are costs rising with respect to time when t = 2?

Explanation / Answer

The final question is just asking you to find the rate of change of cost with respect to time at t=2

So you just plug the value of t=2 in the final equation

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