How to find the sum of a geometric series.
How to find the general term of a geometric sequence.
How resistors in series affect current flow.
How capacitors in series affect current flow.
How to define a series.
How to find the sum of an arithmetic series.
How to understand what vectors are, and how they can be represented geometrically.
How resistor circuits incorporate resistors in parallel and in series.
How to add vectors geometrically two ways.
Understanding the variations in the structure and composition of individual molecules with the same chemical formula.
Understanding standing waves.