Question

A triangle has sides measuring 8 inches and 12 inches. If x represents the length in inches of the third side, which inequality gives the range of possible values for x?

Answer 1

I'm as sure as I can be that wherever you copied the problem from,
there was also a list of choices next to it, from which to select an
answer, but which you decided for some strange reason not to share
with the people you want help from.

The inequality is 4 < x < 20 .

You'll find it right there on the list of choices.