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In the monomial $5x^{2}$, $5$ is the coefficient.

How do we know that $5$ is the coefficient?

A coefficient is a letter that is being multiplied by a number.

A coefficient is an exponent of a variable.

A coefficient is a number that is being multiplied by a variable.

A coefficient is a variable that is being divided by a whole number.

A coefficient is a number that comes first.