Most of the Galaxies in the Local Group Are:
A)big $\text { M31. }$

question 50

Multiple Choice

Most of the galaxies in the Local Group are:

• A)big spirals like our Galaxy and \(\text { M31. }\)
• B)small spirals like \(\text { ?33 }\) nd the LMC.
• C)small irregulars like the Magellanic Clouds.
• D)active galaxies like Centaurus A.
• E)small ellipticals like the companions to M31 in Andromeda.

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Definitions:

Marginal Revenue

The additional revenue that a firm receives from selling one more unit of a good or service.

Average Total Cost

The total cost of production divided by the total output or quantity produced.

Monopolistically Competitive Firm

A firm that operates in a market with many competitors, each offering a slightly different product.

Profit-Maximizing Quantity

The level of production at which a firm achieves the highest possible profit, where marginal revenue equals marginal cost.