The cost function for the manufacture of mp3 players is Dollars.

a) How many mp3 players should be manufactures to minimize the cost?

b) What is the resulting average cost of an mp3 player?

Note: X= number of mp3 manufactures

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I'm stumped. This question was given to me by my Finite Maths teacher under the topic of 'Application of Derivatives', and I don't seem to be making any progress. I'd appreciate it if you guys could help me out

thanks!

EDIT: Correction in the problem