Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.3 - Integers: Addition and Subtraction - Problem Set 1.3 - Page 19: 14

$-5$

In the given expression, $ 9+(-14) ,$ the first number is $\text{ positive }$ and the second number is $\text{ negative }$. Since the signs are different, we subtract the numbers and copy the sign of the bigger number. Hence, the given expression simplifies to \begin{array}{l}\require{cancel} -5 .\end{array}