Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 1 - Foundations for Algebra - 1-2 Order of Operations and Evaluating Expressions - Practice and Problem-Solving Exercises: 17

Answer

2

Work Step by Step

This is an order of operations problem. There are no parenthesis, so the first operation is the exponent. $3^{2}$=9, so we simplify to find: 20-2$\times$9 Multiplication is the next order of operation, so it follows: 20-2$\times$9=20-18=2
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