## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson

# Chapter 1 - Introduction to Algebraic Expressions - 1.5 Addition of Real Numbers - 1.5 Exercise Set - Page 42: 67

#### Answer

The total elevation dropped by $-\frac{7}{10}$ ft.

#### Work Step by Step

Write the question as a numerical expression for the changes in elevation, and add from left to right. $-\frac{2}{5} + \frac{9}{10} + (-\frac{6}{5})$ = $-\frac{4}{10} + \frac{9}{10} + (-\frac{12}{10})$ = $\frac{5}{10} + (-\frac{12}{10})$ = $-\frac{7}{10}$

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