## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

RECALL: $(f+g)(x) = f(x) + g(x)$. This means the value of $(f+g)(x)$ is equal to the sum of the values of $f(x)$ and $g(x)$. Thus, in the graph of $(f+g)(x)$, the height of $(f+g)(a)$ is equal to the sum of the heights of $f(a)$ and $g(a)$. Therefore, the answer is: sum