english is obligatory as a second tongue in europe and espaol is obligatory in amrica, portuguese would work in both lands as a "why not".   chinese isnt exactly a official tongue, but more something like a lingua franca inside china.   its complicated, you have pseudo runes for specific purposes and they are dying.   math is a language, see this please:    ada/services/health-services-benefi ts/medical-assistance-dying.html#a2
Chile