Uśmiechnięty mężczyzna nauczyciel w wizytowym przytrzymując wskaźnik drewniane przed tablica z równania - Zdjęcie stockowe & obraz

Serious male teacher in formal wear holding wooden pointer in front of chalkboard with equations

Handsome male teacher in formal wear holding wooden pointer and explaining equations in class

Focused male teacher in formal wear looking at camera and holding wooden pointer in front of chalkboard with equations

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

Portrait of male teacher near blackboard in classroom

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

Scientist exploring. On way to success. Teacher work with microscope. Science concept. Scientist with microscope chalkboard background. Discovering micro world. Scientific project. Scientist in lab.

Male teacher wiping mathematical equations with sponge from chalkboard in classroom

Smiling female teacher with wooden pointer explaining mathematical equations in classroom

Female teacher with wooden pointer explaining mathematical equations in classroom

Partial view of female teacher in formal wear with wooden pointer explaining mathematical equations in classroom

Smiling female teacher with wooden pointer explaining mathematical equations in classroom

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

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

Female teacher standing in formalwear near chalkboard and holding glasses

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