Represent the following phrase as an algebraic expression, where "a number" is the letter \( x \). You do not need to simplify. 4 is multiplied by the difference of 5 and a number.

To represent the phrase, we first recognize that "the difference of 5 and a number" can be expressed as \( 5 - x \). Now, since 4 is multiplied by this difference, we write the expression as \( 4(5 - x) \). In this expression, \( x \) captures "a number" while \( 4(5 - x) \) represents the entire operation described!