The problem asks to graph the opposite of $-0.4$ on the number line.

1. Problem Description

The problem asks to graph the opposite of $-0.4$ on the number line.

2. Solution Steps

The opposite of a number is the number with the opposite sign. The opposite of $-0.4$ is $-(-0.4)$, which is $0.4$.

To graph the opposite of $-0.4$, we need to locate $0.4$ on the number line.

3. Final Answer

The opposite of $-0.4$ is $0.4$. The green dot needs to be moved to the $0.4$ mark on the number line.