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

$\color{blue}{7+4x}$
The expression "times" means the operation involved is multiplication. Thus, if we let the number be $x$, "four times a number" means $4(x)$ or $4x$. The expression "the sum of" means the operation involved is addition. Therefore, "The sum of 7 and four times a number" means: $\color{blue}{7+4x}$