ID 109925145 © Terovesalainen | Megapixl.com
Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
algebra black blackboard board calculate calculation campus chalk chalkboard classroom close complex concept drawing drawn education engineer equation focus formula full geometry handwritten high lab learn lecture lesson many math mathematical mathematics maths number pattern physics problem research room school science scientific sign solution studying sum teach theory university white write