May I please get help with this math problem. I have tried several times to get the right answer but still have not found it

From the triangle inequality theorem, we know that the sum of the lengths of any two sides od a triangle is greater than the length of the third side. In our case, this means that
[tex]\begin{gathered} 11+19>x \\ 11+x>19 \\ \text{and} \\ 19+x>11 \end{gathered}[/tex]we can put these results as follows
[tex]\begin{gathered} 19-11therefore, the answer is[tex]8