Question

which notation indicates a reflection over the y - axis

Explanation:

A reflection over the y-axis transforms each point $(x, y)$ on the parent function $f(x)$ to $(-x, y)$. This corresponds to replacing $x$ with $-x$ in the function notation, resulting in $f(-x)$. In contrast, $-f(x)$ represents a reflection over the x-axis.

Answer:

$f(-x)$