Kachapova, FBlack, MKlymchuk, SKachapov, I2021-11-222021-11-2220072007Mathematics Teaching-Research Journal Online. Vol 2, N 1.2573-4377https://hdl.handle.net/10292/14699Readers are free to copy, display, and distribute the articles as long as the work is attributed for non-commercial purposes only, and no alteration or transformation is made in the work. All other uses must be approved by the author(s) or MTRJ. MTRJ is published by the City University of New York at https://commons.hostos.cuny.edu/mtrj and it is an open-access journal. There are no processing fees for submissions or publications.Journal ArticleOpenAccess6698