Profesor masculino sentado en el escritorio, señalando con el dedo en el aire y explicando ecuaciones en el aula de matemáticas - Foto e imágenes de stock

Male teacher in formal wear wiping mathematical equations with sponge in classroom

Smiling male teacher in glasses sitting at desk and showing laptop with blank screen in classroom

Male teacher in formal wear writing equation on chalkboard in maths class

Male teacher taking a question from the class as he stands in front of a blank chalk board extending his hand

Female lecturer standing in glasses and showing equations near student

Male teacher wiping mathematical equations with sponge from chalkboard in classroom

Female professor showing equations in classroom

Teacher pointing at equations in classroom with student

Female teacher in glasses sitting at desk and pointing at laptop with blank screen in classroom

Crumpled paper balls flying at frightened female teacher in classroom with chalkboard on background

Beautiful pensive female teacher in formal wear and glasses in classroom

Female teacher looking at camera and pointing with finger at mathematical equation on chalkboard in class

Female teacher sitting at computer desk, holding glasses and having headache in class

Female teacher in formal wear holding glasses and looking away in classroom

Crumpled paper balls flying at frightened female teacher in classroom with chalkboard on background