Todd Southworth brings this huge sign assemblage from Pomona, California.
Mr. Southworth freely admits that he shot this photo and figured the math out later. This solution wasn’t an epiphany while going down the road at 70 miles an hour. He noticed the 71 + 10 first, realizing that was 81 which is easily 9 via a square root. The rest came together nicely! Hats off for the use of the factorial! ! ! !
57 – 42 + \sqrt{71 + 10} = 4!
This sign is on on eastbound I-10 at the Kellog Interchange where I-10, CA 57 and CA 71 meet in Pomona, California. See sign on map!
2 responses so far ↓
1 Mgccl // Oct 1, 2007 at 7:31 pm
xD. this blog is seriously funny, math with roads… xD. I like it. adding to my reading list…
2 Eric D! // Sep 13, 2008 at 6:05 pm
I know I’m late, but in couldn’t the square root of 9 be positive or negative? If it were negative, the expression would end up equaling just 4, not 4!.
57 – 42 + -√(71+10) = 4
15 – 9 = 4
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