Suppose the Average Costs of a Mining Operation Depend on the Number

question 54

Multiple Choice

Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by , , where x is the number of machines used. How many machines give minimum average costs? ​

• A)Using 25 machines gives the minimum average costs.
• B)Using zero machines gives the minimum average costs.
• C)Using 35 machines gives the minimum average costs.
• D)Using 50 machines gives the minimum average costs.
• E)Using 55 machines gives the minimum average costs.

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