​Average Costs

question 82

Multiple Choice

​Average costs.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 14 machines gives the minimum average costs.
• B) ​Using zero machines gives the minimum average costs.
• C) ​Using 24 machines gives the minimum average costs.
• D) ​Using 28 machines gives the minimum average costs.
• E) ​Using 33 machines gives the minimum average costs.

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Definitions:

Preexisting Duty

An obligation that a party is already legally bound to perform, which cannot serve as consideration for a new contract.

Bilateral Contract

A type of agreement involving two parties where each side promises to fulfill certain obligations to the other; a mutual exchange of promises.

Unilateral Contract

A type of contract in which only one party makes a promise or commitment in exchange for an act performed by the other party.

Illusory

Something that is misleadingly attractive or gives a false impression of reality.