Stock image by GiGra Young student looking at chalkboard with mathematics GiGra info Author Page Portfolio: 243 images. Updates / RSS Network Image updated—February 17, 2014 Keywords adult, algebra, blackboard, board, businessman, caucasian, chalk, chalkboard, classroom, college, concept, download, education, equation, formula, geometry, graphic, handsome, Image, knowledge, learn, lecture, lesson, looking, male, man, math, mathematical, mathematics, people, person, physics, problem, professor, school, science, solution, standing, Stock Image, student, students, study, teacher, theory, thinking, university, young Image Categories People Image #554 Size Type File Info Price ( US Dollars $ ) Bloggeejpg3.47" × 3.14" @ 72 dpi250 × 226px2.50 Smalljpg6.94" × 6.28" @ 72 dpi500 × 452px5.00 Mediumjpg13.89" × 12.57" @ 72 dpi1000 × 905px10.00 Largejpg16.57" × 14.99" @ 300 dpi4970 × 4496px20.00 End User License Agreement DOWNLOAD (0.00) Symbiostock Community Symbiostock CommunityNetwork with illustrators, photographers, and designers. Symbiostock on TwitterSymbiostock news. Symbiostock on FacebookCommunity maintained Facebook hub. Symbiostock.infoSearch images on the Symbiostock network. Symbiostock SearchSearch Symbiostock images and network. Symbioguides.comSymbiostock knowledge base. Symbiostock.comSell your images and network with fellow microstock professionals. ClipArtof.comHigh Resolution Stock Illustrations & Clip Art ClipArtIllustration.comFirst Symbiostock Site, and home of the Orange Man Microstockgroup.comA meeting place for microstock professionals.