Saved detailed hints under new name
Prevent coefficient of g being -1

When the coefficient is -1 there is some weird formatting.

fix #43391

Test plan: minimal

Auditors: alpert, beneater
Remove u and v from array of possible variables
Make sure exercises use randVar when picking a random variable
Merge pull request #43434 from petercollingridge/randvar2

fix #43236; fix #43385;

Test plan: check each exercise still displays an equation

Auditors: beneater, cbhl
Minor typo

'isoceles' to 'isosceles'
fix #41775;

Test plan: Check my spelling

Auditors: beneater, alpert
Merged old branch from age problem hints
Fix an arg mismatch: extract_file() does not take a verbose arg.

Audit: john
Update khan-exercise.js

Unbloating
Merge pull request #43487 from ziggyism/patch-1

Refactor related-video mouse event logic
Added forms to solution in completing the square 1 and 2 socompleting the square is necessary
Merge branch 'master' of https://github.com/Khan/khan-exercises into backup
Merge branch 'completeSquare'