Procedural and Conceptual Difficulties with Slope: An Analysis of Students’ Mistakes on Routine Tasks. International Journal of Research in Education and Science, [S. l.], v. 3, n. 1, p. 135–150, 2017. Disponível em: https://ijres.net/index.php/ijres/article/view/873. Acesso em: 28 jun. 2025.