Translate the phrase "seven more than a number" into an algebraic expression using a variable n.

In the verbal description 'the expression 3x + 4 represents 3 multiplied by an unknown number plus 4', which are the variable, coefficient, and constant term, respectively?

A student earned s points on a quiz. For the semester, quizzes count for $20\%$ of the grade, and the student wants to calculate the quiz contribution to the semester grade as a percentage: "twenty percent of the quiz total, $s$." Which algebraic expression represents that contribution?

A traveler has b dollars. They spend 120 dollars on a hotel and then use one-third of the remaining money for food. Represent the amount spent on food as an algebraic expression in terms of b.

A household's monthly utility bill consists of a fixed fee and a usage charge. The fixed fee is 30 dollars, and the usage charge is 0.12 dollars per unit $u$ consumed. Which algebraic expression represents the total monthly bill?