Many problems can be solved most easily by using vector operations. Some problems as well can't really be expressed very well, without reference to vector operations and directions themselves.

In mathematics, an algebraic expression is an expression built up from constants, variables, and a finite number of algebraic operations (addition, subtraction, multiplication, division and exponentiation by an exponent that is a rational number).

Factorials are products, indicated by an exclamation mark. For instance, "four factorial" is written as "4!" and means 1×2×3×4 = 24. In general, n! ("enn factorial") means the product of all the whole numbers from 1 to n; that is, n! = 1×2×3×...×n.

A proportion is a name we give to a statement that two ratios are equal. When two ratios are equal, then the cross products of the ratios are equal.

In this lesson you will learn how to graph logarithmic functions. The properties such as domain, range, vertical asymptotes and intercepts of the graphs of these functions are also explained.