Use expression editor forsolution
Allow terms with degree > 1 to be defined without using a hash
Merge remote-tracking branch 'upstream/master' into sim-rat-exp-1
Merge remote-tracking branch 'upstream/master' into sim-rat-exp-1
Merge remote-tracking branch 'origin/master' into sim-rat-exp-1
Use expression editor
Volume with unit cubes 2
Volume 3
Volume 3 height exercise
use localized decimals
Mark no input as empty instead of wrong for geometry proofs 1
Mark no input as empty instead of wrong for geometry proofs intro
Fix unstyled MathJax/Katex hint for geometry intro shared problem
Add flag in sorter object to test if user has attempted to move numbers
Check answer only if tile has been dragged, otherwise count as empty
Change wording to avoid best fit
Add new exercise type with non-linear trends
use localized decimal
correct hint, fix #82420
localization, fix #81302

* don't calculate with localized decimals
* don't use localized decimal in solution
* show localized decimals