Algebraic Expressions and the Order of Operations COURSE 3 LESSON 1-1 A student earns $5 an hour babysitting. The hours vary from week to week. Define a variable. Write an algebraic expression for how much the student earns in a week. $5 an hour times number of hours spent babysitting Let h = number of hours spent babysitting. Words Expression 5 • h The algebraic expression 5h represents the student’s weekly earnings. 1-1

Algebraic Expressions and the Order of Operations COURSE 3 LESSON 1-1 Evaluate p – 23 for p = 10. Substitute 10 for p. p – 23 = 10 – 23 = – 13 Simplify by subtracting 23 from 10. 1-1