1. Department of Pure and Applied Mathematics, Ladoke Akintola University of Technology, Ogbomoso 212102, Nigeria
2. Department of Physics, Mathematics and Informatics, Dar es Salaam University College of Education, Dar es Salaam 2329, Tanzania
3. Department of Mathematics and Computing Science Education, Emmanuel Alayande University of Education, Oyo 211172, Nigeria
4. Department of Education, Vaal University of Technology, Vanderbijilpark 1911, South Africa
5. Department of Mathematics, University of Kansas, Lawrence, KS 66045, USA