These highway signs are in Bisbee, Arizona. MathBabbler took this picture while staying in Bisbee for Pi Day 2011.

The highway signs say...

+------------+ +--------------+ +------------+ | AZ 80 West | | 16 FT - 6 IN | | AZ 80 East | | Old Bisbee | +--------------+ | Douglas | +------------+ +------------+ +-------+ +-------+ | Speed | | Speed | | Limit | | Limit | | 25 | | 25 | +-------+ +-------+the numbers are: 80 16 6 80 25 25 the math is: 80 / (80 / 16) - 6 - sqrt(25) = sqrt(25) more math: 80 / sqrt(25) * sqrt(80 / sqrt(25)) = (sqrt(sqrt(16))^6 more math: 6 - 80 / 80 - 25 / 25 = sqrt(16) more math: 16^(80 - 80) = 6^(25 - 25) rsPhiEval: ((80/80 + sqrt(25 / sqrt(25))) / (6 - sqrt(16)) = Phi * Phi is the golden ratio and it approximates 1.61803399 rsStateEval: cuberoot(sqrt(80 - 80 / sqrt(25))) * 6! / sqrt(25)! * sqrt(16) = 48 * Arizona was the 48th state admitted to the Union.MathBabbler visited Bisbee during June of 2007 and he took a picture that excluded the speed limit signs and during July of 2007 MathBabbler posted MathBABs.us::BARS::AZ Hwy-80 Underpass in Bisbee, Arizona

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 20 March 2011

This work is licensed under a Creative Commons Attribution 3.0 United States License.