numbas-elm-theme/mathjax-config.js

MathJax = {
  tex: {
    inlineMath: [['$', '$'], ['\\(', '\\)']],
    packages: {'[+]': ['numbas']}
  },
  loader: {
    load: ['[custom]/numbas-mathjax.js'],
    paths: {custom: '.'}
  }
};