How would you approach this level 5 math problem?

JefferyJung
Sun, 25 Sep 2011 15:40:29 +0000

[photo (1) - Minus.com](http://minus.com/mf1nBn6m6#1f)

The answer is E. I did get the correct answer, but I wouldn’t have been able to solve this without my Pre-Calculus class I took my sophomore year.
Is there an easier solution that I’m not getting?