Keywords
algebra, alphabet, blackboard, calculating, capital letter, chalk, color image, colored background, day, digital, eraser, focus on foreground, formula, green, handwriting, high angle view, indoors, letter c, letter e, letter m, letter x, letter y, mathematical symbol, mathematics, nobody, number, number 2, photography, selective focus, series, stationary, still life, studio shot, text, two objects, vertical, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, u12714626