Without a standard order, the same problem could yield different answers. Mathematicians agreed on PEMDAS:
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Master Numerical Expressions: Lesson 2 Homework Practice Guide Lesson 2 Homework Practice Numerical Expressions Answers
Answer: 1
This guide breaks down the core concepts of numerical expressions so you can check your work and understand the behind every calculation. What is a Numerical Expression? Without a standard order, the same problem could