A middle-aged man with a beard teaches an online math class, pointing to a formula on a chalkboard. — Stock photos

"A middle-aged man with a beard teaches an online math class, pointing to a formula on a chalkboard." is a stock image by IgorVetushko. It’s available in the following resolutions: 1000 x 667px, 2000 x 1333px, 8256 x 5504px. The minimum price for an image is 2.99$. Image in the highest quality is 8256 x 5504px, 300 dpi, and costs 9.99$.