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

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