What is a letter or symbol put in place of a number?

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Multiple Choice

What is a letter or symbol put in place of a number?

Explanation:
A letter or symbol in place of a number is a variable. In algebra, a variable represents an unknown amount that can change depending on the problem. This is different from a digit, which is one of the numerals 0–9 used to write numbers; a constant, like 5 or -2, is a fixed value that doesn’t change in the expression; and a coefficient is a number that multiplies a variable, such as the 3 in 3x. So when you see a letter standing in for a number, you’re looking at a variable that stands for an unknown value you may solve for or substitute later. For example, in x + 4, x is the variable representing some number you don’t know yet.

A letter or symbol in place of a number is a variable. In algebra, a variable represents an unknown amount that can change depending on the problem. This is different from a digit, which is one of the numerals 0–9 used to write numbers; a constant, like 5 or -2, is a fixed value that doesn’t change in the expression; and a coefficient is a number that multiplies a variable, such as the 3 in 3x. So when you see a letter standing in for a number, you’re looking at a variable that stands for an unknown value you may solve for or substitute later. For example, in x + 4, x is the variable representing some number you don’t know yet.

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