How to define joint and combined variation.
How to define direct variation.
Understanding the concept of genetic variation.
How to define indirect variation.
How to find the number of combinations of a set.
How to tell if two variables vary inversely.
How to tell if two variables vary directly.
How to know when to use combinations or permutations.
The combined law for gases.
How to simplify expressions by distributing and/or combining like terms.
The fast evolution of species with a common ancestor.
Combining capacitors and resistors in electric circuits.
How to add or subtract polynomials.
Recognizing and understanding synthesis reactions.
How to define a composition of transformations; how to perform a composition of translations.
How to use the fundamental counting principal.
Understanding the variations in the structure and composition of individual molecules with the same chemical formula.