1. 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.
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2. 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.
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