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Pearson Algebra 1 Common Core, 2015
PA
Pearson Algebra 1 Common Core, 2015 View details
1. Variables and Expressions
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Exercise 1 Page 7

Practice makes perfect
a Let's start by reviewing the definitions of an algebraic and a numerical expression.
  • Algebraic Expression: a mathematical phrase that includes one or more variables.
  • Numerical Expression: a mathematical phrase involving numbers and operation symbols, but no variables.
Now, let's analyze the given expression.
As we can see, it involves two numbers and the operation symbol of division, but does not contain any variables. Therefore, this is a numerical expression.
b Similarly, we can examine the second expression.
Notice that it contains a variable which allows us to conclude that this is an algebraic expression.
c Let's now analyze the last given expression.
It contains numbers and operation symbols, but no variables. Therefore, it is a numerical expression.
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arrow_right Lesson Check p.7
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arrow_right Practice and Problem-Solving Exercises p.7-9
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