Solution:
The distance between two points can be calculated by the formula
[tex]\begin{gathered} (x_1,y_1)=(2,8) \\ (x_2,y_2)=(-1,9) \\ d=\sqrt[]{(-1-2)^2+(9-8)^2} \\ \end{gathered}[/tex][tex]\begin{gathered} d=\sqrt{(-3)^2+(1)^2} \\ d=\sqrt{9+1} \\ d=\sqrt{10} \end{gathered}[/tex][tex]The\text{ answer is }\sqrt[]{10}[/tex]
