. Change square_roots to use sqrt symbol. . Use final_solution class where appropriate. . Minor language tweak. . Reduce size of answer boxes for simplifying_radicals.html

Reviewers: eater

Differential Revision: http://phabricator.khanacademy.org/D416
#row37 of exercise fixit
remove the word adjacent from all number line questions

Summary: trival little FIXIT to get thing moving

Test Plan: tested locally with SimpleHTTPServer

Reviewers: emily

Reviewed By: emily

Differential Revision: http://phabricator.khanacademy.org/D418
New problem types for graphing linear equations: horizontal and vertical lines.

Summary:
I added horizontal and vertical lines per https://trello.com/card/graphing-vertical-and-horizontal-lines/4fa477356968b1557b0964ce/134 and https://docs.google.com/a/khanacademy.org/document/d/1eMCv-sO6XKJG5nRNajK-ySHyC9fBquerzuqF6LBsV2w/edit.
I'm sure there are a million and one mistakes. I apologize in advance. If you'd like me to redo the overall exercise inheritance structure, don't hesitate, just learning how to FIXIT.

Test Plan: tested normal, vertical, and horizontal lines, expanding hints, checking right/wrong answers, etc.

Reviewers: eater, emily

Differential Revision: http://phabricator.khanacademy.org/D419
Fix typo in hint -- thanks Jesse
Fixed spacing after comma
Slightly reworded hint, thx Jesse
Another reworded hint, thx Eater
#row19 fix it for quadratics + cleaned up abs value checking
Add a <br /> to exploring_mean_and_median question #FIXIT

Summary:
When MathJax rendered the median at a line break, the MathJax span was
sometimes not visible. When this happens, it will magically appear as soon as
you start poking around in the DOM inspector. Rather than chasing an obscure
MathJax/browser bug, this adds a linebreak to prevent this condition from
happening in the first place.

This also changes the graphie scale to 35 from the default of 40 to fit the
narrower power-mode format on narrow screens.

Reviewers: emily

Reviewed By: emily

Differential Revision: http://phabricator.khanacademy.org/D420
Don't mark graphing_linear_equations wrong until points are moved

Reviewers: kamens

Reviewed By: kamens

Differential Revision: http://phabricator.khanacademy.org/D421
. Change square_roots to use sqrt symbol. . Use final_solution class where appropriate. . Minor language tweak. . Reduce size of answer boxes for simplifying_radicals.html

Reviewers: eater

Reviewed By: eater

Differential Revision: http://phabricator.khanacademy.org/D416
Merge branch 'master' of http://github.com/Khan/khan-exercises into kittbold
Add parallel line markers to parallel lines #FIXIT

Reviewers: emily

Reviewed By: emily

Differential Revision: http://phabricator.khanacademy.org/D423
Ensure addition_4 always requires carrying #FIXIT

Reviewers: emily

Reviewed By: emily

Differential Revision: http://phabricator.khanacademy.org/D425
Adjust subtraction_2 to ask 2-digit problems half the time #FIXIT

Reviewers: emily

Reviewed By: emily

Differential Revision: http://phabricator.khanacademy.org/D426
Add: 3d geometry, and redo most of the solid_geometry exercise

Summary:
Use weird graphie polygons, some basic 3d perspective math, and a lot of weird
hacking to come up with a reasonable 3d graphics display that can be used
relatively easily with current exercises. As a first test, redo the
solid_geometry exercise to take advantage of the 3d goodness

Test Plan: Tested everything in multiple browsers, everything so far seems to be fine.

Reviewers: eater

Reviewed By: eater

Differential Revision: http://phabricator.khanacademy.org/D388
Add debug logging
Merge pull request #26456 from mwahl/master

Updated quadratics exercises