Maths renders properly in a lesson page, in the question and in the mark scheme.
Writing an equation
Click into the page where you want it, type /, and pick from the menu. Typing after the slash filters the list.
Choose Inline Math for an equation inside a sentence, or Math Block for one on its own line.
Type LaTeX. The symbol picker covers the common ones if LaTeX is not your thing.
Students can answer with maths too, using the same two options in their answer box.