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By definition, what is a variable in algebra?

AA letter that always stands for the number one
BA letter that represents a number that can change
CA number whose value can never change at all
DA symbol used only to group parts together
Answer & Solution
Correct answer: B. A letter that represents a number that can change
1. The definition says a variable is a letter, not a fixed numeral. 2. That letter stands in for a number, and the key property is that its value can change. 3. This differs from a constant, whose value always stays the same. _Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 1 "Foundations", section 1.2 Use the Language of Algebra_
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