Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.5 - Use of Properties - Problem Set 1.5 - Page 33: 24

$-4,900$

We start with the given expression: $-49(72)-49(28)$ We can use the distributive property to rewrite the expression as $-49(72+28)$ because each term was being multiplied by $-49.$ We simplify inside the parentheses: $-49(100)$ We multiply: $-4,900$