Chapter 5 - Number Theory and the Real Number System - 5.5 Real Numbers and Their Properties; Clock Addition - Exercise Set 5.5 - Page 308: 18

$3 \cdot (6+4) = 3 \cdot 6 + 3\cdot \underline{4}$

The distributive property states that for any real numbers $a, b, $ and $c$, $a(b+c) =a\cdot b+a \cdot c$ Thus, apply the distributive property to the given problem to find: $3 \cdot (6+4) = 3 \cdot 6 + 3\cdot 4$