Khan/khan-exercises — pull request #30647 by xymostech (2012-09-23 04:36:36+00:00)
Title: Fix calculator exponent associative order

The calculator used to incorrectly calculate multiple exponents. For example `2^3^4` would produce 4096, when the real answer is 2.4178516e+24. (https://www.google.com/search?q=2%5E3%5E4) By switching the associativity order from left to right, everything works great.

@beneater @spicyj