New quiz question types

You can now create quizzes with two new kinds of questions:

Multiple answer
questions present students with a list of choices and allow them to select one
or more
as their answer. Students receive credit only if they have selected all of the correct choices (and none of the incorrect ones!).
Mathematical expression
questions allow students to enter their answers using a graphical math editor. Answers are considered correct if they are algebraically equivalent to the correct answer. (For example, if the correct answer is
2x
, then entering
x+x
would also count as correct.)