Answer:
7
Step-by-step explanation:
The formula of a distance between two points:
[tex]d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]
We have the points (3, 8) and (10, 8). Substitute:
[tex]d=\sqrt{(10-3)^2+(8-8)^2}=\sqrt{7^2+0^2}=\sqrt{7^2}=7[/tex]
Other method.
The second coordinate of points is the same. Therefore, the distance between these points is equal to the absolute value of the difference between other coordinates:
[tex]d=|3-10|=|-7|=7[/tex]
