Chapter 3 - Introduction to Graphing - 3.3 Graphing and Intercepts - 3.3 Exercise Set - Page 180: 90

$\color{blue}{\frac{1}{2}(x+y)}$

Work Step by Step

The expression "sum of two numbers" means the operation involved is addition. Thus, if we let the numbers be $x$ and $y$, then "the sum of two numbers" means $x+y$. The expression "half of" means the operation involved is multiplication, and the number to be multiplied is $\frac{1}{2}$. Therefore, "half the sum of two numbers" means: $\color{blue}{\frac{1}{2}(x+y)}$

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