Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 2 - Real Numbers - 2.3 - Real Numbers and Algebraic Expressions - Problem Set 2.3: 79

Answer

13.75

Work Step by Step

First, we simplify the expression: $1.2x+2.3x-1.4x-7.6x$ =$3.5x-1.4x-7.6x$ =$2.1x-7.6x$ =$-5.5x$ We evaluate the expression by substituting the value of $x=-2.5$ into the expression, $-5.5x$ =$-5.5(-2.5)$ =$-\frac{55}{10}\times-\frac{25}{10}$ =$\frac{-55\times-25}{10\times10}$ =$\frac{1375}{100}$ =$13.75$
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