How to solve a three part inequality.
How to solve linear inequalities.
How to solve a system of linear equations in three variables.
How to graph a quadratic inequality.
How to solve a system of linear equations in three variables that yields no, or many solutions.
How to solve a quadratic inequality using a sign chart.
How to find a test score to keep the class grade at least 90%.
How to derive the quadratic formula by completing the square.