CAN SOMEONE PLEASE HELP ME WITH THIS !!!!!

The ladder is a hypotenuse of a triangle with base of length 5 and vertical side 12, and it is right-angled. Use the Pythagorean theorem.
[tex]12^2+5^2=x^2\\169=x^2\\\sqrt{169}=13=x\\[/tex]
x, the ladder height is 13 units.