Inequalities that use < or > symbols are plotted with a dashed line to show that the line is not included in the region. Inequalities that use ≤ or ≥ symbols are plotted with a solid line to show that ...

https://doi.org/10.4169/college.math.j.44.1.016 https://www.jstor.org/stable/10.4169/college.math.j.44.1.016 Building on two centuries' experience, Taylor & Francis ...

I recently concluded the fall semester of my 56th school year as an elementary educator. I have been a part of many changes in public schooling, having observed too many “innovations” to recall. One ...