Keywords
14-15 years, 50-54 years, african-american ethnicity, arms crossed, asian ethnicity, blackboard, caucasian ethnicity, classroom, day, differential focus, education, explaining, five people, indoors, latin american and hispanic ethnicity, mathematics, mature men, mixed race person, native american ethnicity, number, school, schoolgirl, standing, student, teacher, teenage boys, teenage girls, v, waist up, writing, 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, u15186834