Profesor sonriente sosteniendo tiza cerca de pizarra con fórmulas y cámara digital - Foto e imágenes de stock

Cheerful teacher holding chalk near chalkboard and digital camera in classroom

Teacher talking near math formulas on chalkboard and blurred digital camera in classroom

Teacher holding chalk and talking near chalkboard with formulas and digital camera

Teacher holding chalk near blurred digital camera and chalkboard in class

Positive teacher pointing at digital camera near chalkboard with math formulas

Teacher in eyeglasses talking near blurred digital camera and chalkboard

Teacher talking near digital camera and chalkboard with math formulas in class

Tutor pointing at chalkboard and holding digital tablet near camera in school

Positive teacher holding chalk near math formulas on chalkboard

Smiling teacher looking away and pointing with finger near chalkboard

Brunette doctor in white coat writing chemical formulas on glass board in lab

Selective focus of attractive journalist in formal wear smiling in office

Happy teacher smiling at camera while standing with open arm near chalkboard

Laughing teacher in eyeglasses holding book while standing near chalkboard with open arm

Shocked geometry teacher touching face and pointing with finger at chalkboard with illustration

Low angle view of blurred chemist holding clipboard and felt pen near chemical formulas on glass board

Smiling teacher looking at camera and pointing with finger near chalkboard