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Erasing a blackboard written all over by math problem

Stock Photo:
Image ID: 50974012
Release Information: N/A
Copyright: Tomas Skopal
Small
334x500 4.6"x6.9" (72dpi) 127 KB
Med
667x1000 2.2"x3.3" (300dpi) 408 KB
Large
2848x4272 9.5"x14.2" (300dpi) 3.9 MB
Super
5696x8544 19.0"x28.5" (300dpi) approx.12.0 MB
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