Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - Chapter 1 Review Problem Set - Page 38: 28

$4$

This problem only involves addition and subtraction, so we start on the left and go right according to order of operations. Using order of operations, the given expression, $ 19-23-14+21+14-13 ,$ simplifies to \begin{array}{l}\require{cancel} -4-14+21+14-13 \\\\= -18+21+14-13 \\\\= 3+14-13 \\\\= 17-13 \\\\= 4 .\end{array}