Homework Help: math

Posted by piper on Wednesday, April 7, 2010 at 9:54pm.

The average cost per item, C, in dollars, of manufacturing a quantity q of cell phones is given by
C= (a/q) + b
where a and b are positive constants
a.Find the rate of change of C as q increases. What are its units?
b. Currently, 5000 phones are being made and production is increasing at a rate of 100 cell phones per week. How fast is the average cost changing if a = 200000? Is the average cost increasing or decreasing?

math - San, Monday, October 31, 2011 at 4:42pm
a. C'=-a/q^2 Units: dollars per cell phone unit

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