Fix issue #33473, allow white space in expressions involving subtraction

13-2v or 13 -2v was being accepted, but 13 - 2v was not.
https://github.com/Khan/khan-exercises/issues/33473
Fix typo

Auditors: csilvers
Change capitalization of jQuery

Auditors: csilvers
Fix #33076 remove extraneous hint

Summary: There's no reason for one-root to inherit from original

Test Plan: Tested locally

Reviewers: stephanie

Reviewed By: stephanie

Differential Revision: http://phabricator.khanacademy.org/D897
Forward slashes, not back

Auditors: eater
Fix a bunch of things

Reviewers: emily

Reviewed By: emily

Differential Revision: http://phabricator.khanacademy.org/D904
Convert .gif's to .png's in khan-exercises.

Summary:
The purpose of this conversion is to have (basically) only file format
we use for images, to make our tools more effective.  For instance, we
have a tool for compressing png's, but not gif's.

We've already changed face-smiley to be a .png in stable, so this
mirrors that.

Reviewers: eater

Reviewed By: eater

Differential Revision: http://phabricator.khanacademy.org/D920
Sync exercises/khan-exercise.html

Auditors: csilvers
Copied over review D909. Added a comment.

Summary: I didn't commit --amend, thought it would be easier just with a new branch.

Test Plan: Same as in that review

Reviewers: kamens

Reviewed By: kamens

Differential Revision: http://phabricator.khanacademy.org/D921
Fix width problems in reading_tables_2
Lint
Merge pull request #33787 from xymostech/fix-33675

Fix width problems in reading_tables_2
Remove the solution fallback
Fix fallbacks in answer types

Because `undefined + ""` produces the string `"undefined"`, fallbacks
did not accurately show that they were not available. This causes
some/all of the problems to inaccurately never report that an answer was
not entered. This should fix that.
Fix #33834 regression introduced by new answer-types.js

The multiple answer type wasn't properly tracking data-forms for each element

Test plan: Test http://localhost:8000/exercises/multiplying_mixed_numbers_1.html?debug&problem=0&seed=7 to verify that 23/3 is not accepted after this fix.

Auditors: emily
Restore acceptable format defaulting for multiple answer type

In the case where a "multiple" answer-type doesn't have any examples defined
and contains only one input element, inherit the acceptable formats from that
single input element.

Test Plan: Verify acceptable answers show up for
    http://localhost:8000/exercises/one_step_equations.html

Auditors: emily
Merge pull request #33803 from xymostech/fix-fallback

Fix fallbacks in answer types. fix #33883
Merge pull request #33804 from xymostech/fix-33780

Fix #33780
Add exercises: Finding the determinant of a matrix, finding the inverse of a matrix

Test Plan: Tested locally

Reviewers: eater

Reviewed By: eater

Differential Revision: http://phabricator.khanacademy.org/D891
Allow whitespace after negation and subtraction.

Add \\s* after all instances of [-\\u2212] in exercises and tested.
There is no reason for counting students wrong for variance in formatting
of this type, and it is not infrequent to see expressions as 5 - x in text.