ID 251517697 © Malevich85 | 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.:
formula education mathematic math handwriting school science equation calculation mathematical background knowledge number physics algebra study drawing symbol chalk geometry physical scientific blackboard university abstract complex white black sign texture multiplication experiment function technical energy handwritten plus minus graph text board sketch scheme word many lot hand graphic analysis algorithm