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Fundamental Theorem of Calculus/Marginal Cost---HELP PLEASE

Attachment 26232

The problem I am having with this question is that the formula I was taught to use requires a function for C'(q). I tried doing this problem by simply putting C'(q) at 400 in and was told it was wrong. There may be something simple I am overlooking, but I would greatly appreciate any help you all can offer me with this problem. Thank you!

Re: Fundamental Theorem of Calculus/Marginal Cost---HELP PLEASE

$\displaystyle C(q_2) - C(q_1) = \int_{q_1}^{q_2} C'(q) \, dq$