Read the section beginning with "Simplify Expressions Using the Order of Operations". Pay special attention to the rules for performing multi-step calculations.

Many students remember the order
of operations using the silly phrase **Please Excuse My Dear Aunt Sally**, where the first letter of each word corresponds to a mathematical operation: **P**arentheses, **E**xponents, **M**ultiplication and **D**ivision, and **A**ddition and **S**ubtraction.

Do Examples
2.8–2.12 and check your answers. If you need additional practice, you can do Try It exercises 2.15–2.24.

Click https://cnx.org/contents/yqV9q0HH@19.9:534pfj8-@22/2-1-Use-the-Language-of-Algebra link to open resource.