Courteous expressions are polite phrases and behaviors used to show respect and consideration in communication. They include greetings, thank-yous, apologies, and other forms of acknowledgment that foster positive interactions. Using courteous expressions helps to create a friendly atmosphere and can enhance relationships in both personal and professional settings. Examples include saying "please," "thank you," and "excuse me."
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These two are both similar because they are both expressions.
Expressions have to contain numbers and letters.
Algebraic expressions are terms that do not include an equality sign
An equation if both expressions are equal
Expressions never have equality signs