General forms of a sequence

General form of a sequence:

Arithmetic:

An=A1+(n-1)d

Geometric:

An=A1*R^(n-1)

These equations help translate a table, into a equation, all you have to do is calculate how much the numbers are increasing or decreasing on the y-intercept for the table. If the y-intercept is increasing by a multiplied amount then that table has a geometric equation. If the y-intercept has a continuous strand of numbers increasing by the same increment, then that table has a arithmetic equation.