Question

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

Explanation:

Step1: Identify coordinates

The coordinate of point $P$ is 3 and of point $Q$ is 7.

Step2: Use distance formula on number - line

The distance between two points $a$ and $b$ on a number - line is $|b - a|$. Here, $a = 3$ and $b = 7$, so the length of $\overline{PQ}=|7 - 3|$.

Step3: Calculate the result

$|7 - 3|=4$.

Answer:

4