a mathematical formula on a chalkboard

---

Size: 4752px × 3168px
Photo credit: © Joana Kruse / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: black, board, calculate, chalk, chalkboard, college, complex, complicated, education, equation, formula, intelligence, intelligent, knowledge, learn, lecture, math, mathematical, mathematics, number, problem, school, science, sign, solution, student, study, studying, symbol, teach, theory, university, white