A student has a debit card with a prepaid amount of $270 to use for school lunches. The caferteria charges $4.50 per lunch. Write and expression for the balance on the card after buying x lunches. Does you expresion make sense for all positive interger values of x? explain.
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Writing Expressions with Variables 2.1 The quantity that changes is the number of students who buy school lunches. Think about the situations and answer the questions. School lunch costs $1.85 for each student. Write a numeric expression to determine how much money is collected. Then evaluate the expression to find out how much money is collected when: 1. Fifty-five students purchase a school lunch. 2. One hundred twenty-six students purchase a school lunch. 3. Two hundred thirteen students purchase a school lunch. 4. One thousand five hundred twelve students purchase a school lunch. Write a sentence to describe how you can determine the amount of money collected for any number of students buying school lunches. Question 1: There is one quantity that changes or varies - the number of students who bought school lunches. In mathematics, letters are often used to represent quantities that vary. These letters are called variables, and they help you write algebraic expressions to represent situations. An algebraic expression is an expression that has at least one variable. Write an algebraic expression to represent the total amount of money collected for any number of students buying school lunches.
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