Five new Microsoft Forms features for Education | July 2021

GolferSugarwood , 
(1) I don't know on this one; I think a Likert question is the closest you can get to having a multi-question type currently, but that may be different for EDU.

(2) https://support.microsoft.com/en-us/office/add-a-picture-to-a-question-72ffc881-c22e-4069-8468-400d1c580871
(3) https://techcommunity.microsoft.com/t5/education-blog/create-a-math-quiz-in-microsoft-forms/ba-p/202341  (this is from 2018, though, don't know if it is still relevant.  If not, I have used the character map to copy/paste symbols into Forms).