The cost in dollars of producing x units of a particular brand of notebook is C(x) = x^2 – 400.
a)Find the average rate of change of C with respect to x when the production level is changed from x = 100 to x = 102. Include units in your answer.
b)Find the instantaneous rate of change of C with respect to x when x = 100. Include units in your answer.

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really could use some help on this on !!!

How do you think you should approach this? what do the terms average and instantaneous mean to you?

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