7.1: Opposites

$a$ is a rational number. Choose a value for $a$ and plot it on the number line.

 Based on where you plotted $a$, plot $\text a$ on the same number line.
 What is the value of $\text a$ that you plotted?
 Noah said, “If $a$ is a rational number, $\text a$ will always be a negative number.” Do you agree with Noah? Explain your reasoning.