Khan/khan-exercises — Issue #14106: Compound inequalities - Inequality Answers
Author: KhanBugz
Created: 2012-02-18 02:00:54+00:00
State: open
Labels: chrome, wrong-or-unclear

when solving the inequality problem 2z+4<6 or -6z+4>10 you get z<1 or z<-1. There are two answers that would answer this. z<1 and the other is z<1 or z<-1. Technically they are both right, aren't they? I learned about inequalities in school and have not watched any of Sal's videos on this subject.

[compound_inequalities.html?seed=43&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/compound_inequalities.html?seed=43&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/compound_inequalities.html?seed=43&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%20%5C%5C%5C%22%3Ez%26lt%3B1%3C%2Fcode%3E%20or%20%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%20%5C%5C%5C%22%3Ez%26lt%3B-1%3C%2Fcode%3E%5C%22%22%2C410%5D%2C%5B%22hint-activity%22%2C%220%22%2C7%5D%2C%5B%22hint-activity%22%2C%220%22%2C7%5D%2C%5B%22hint-activity%22%2C%220%22%2C8%5D%2C%5B%22hint-activity%22%2C%220%22%2C8%5D%5D)

["z<1 or z<-1"]

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.7 (KHTML, like Gecko) Ubuntu/11.10 Chromium/16.0.912.77 Chrome/16.0.912.77 Safari/535.7

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