Professeur de cheveux gris pointant sur quelque chose avec crayon sur tableau noir - Photo & image de stock

Grey hair professor pointing on something with finger at blackboard

Pensive grey hair professor standing at blackboard with piece of chalk

Happy senior lecturer holding paper plane in hand

Grey hair professor correcting something at blackboard

Grey hair professor looking at students rising hands

Grey hair professor pointing on something with wooden pointer

Happy senior lecturer with open arms standing near blackboard

Tired grey hair professor touching eyes at blackboard

Cropped image of senior professor pointing on something with pencil on blackboard

Cropped image of professor drawing with piece of chalk at blackboard

Cropped view of man with chalk writing numbers on blackboard

Cheerful schoolchild adjusting eyeglasses near chalkboard with mathematic equations

Cropped view of man writing numbers with chalk on blackboard

African american teacher writing on chalkboard near blurred laptop during video call in classroom

African american teacher writing on notebook near globe in classroom

Excited schoolgirl in eyeglasses showing idea gesture near chalkboard with equations