Find All Replacements (Less Than the Modulus) for the Question

question 10

Multiple Choice

Find all replacements (less than the modulus) for the question mark that make the statement true.
-7 ∙ ? ≡ 8 (mod 9)

• A) 8
• B) 5
• C) 2, 6, 7
• D)1, 3

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Definitions:

Price Discrimination

A pricing strategy where a company sells the same product to different customers at different prices based on market factors, demand elasticity, or customer characteristics.

Marginal Revenue Curve

A graphical representation showing how marginal revenue varies as output quantity changes.

Price Effect

The change in the quantity demanded of a good or service caused by a change in its price.

Deadweight Loss

The loss of economic efficiency that occurs when the equitable market outcome is not achieved, often due to taxes, subsidies, or artificially imposed prices like price ceilings or floors.