Question

what is the length of $overline{de}$?

Explanation:

Step1: Identify coordinates

The coordinate of point $D$ is $- 2$ and of point $E$ is $0$.

Step2: Use distance formula

The distance between two points $x_1$ and $x_2$ on a number - line is $|x_2 - x_1|$. Here $x_1=-2$ and $x_2 = 0$, so $|0-(-2)|$.

Step3: Simplify the expression

$|0 - (-2)|=|0 + 2|=2$.

Answer:

$2$