### Concept (1)

When modeling real world situations, we often use what's called inverse or indirect variation to describe a relation between two variables. Indirect variation is a relation in which the absolute value of one variable gets smaller while the other gets larger. Indirect variation and direct variation are important concepts to understand when learning equations and interpreting graphs.

### Sample Problems (12)

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Given 27, -9, 3, -1 ...

find an and a8
###### Problem 1
How to find the general term of a geometric sequence when given the first few terms.

Given a geometric sequence with a2 = 6 and a4 = ⅔.

Find an
###### Problem 2
How to find the general term of a geometric sequence when given two random terms.
###### Problem 3
How to write the first four terms of a geometric sequence from an explicit formula.
###### Problem 4
Writing both explicit and recursive formulas for the same geometric number sequence.
###### Problem 5
Finding the tenth term from a number list of a geometric sequence.
###### Problem 6
Using a geometric sequence to model population growth or decline.
###### Problem 7
How to find the first four terms of a geometric sequence from a recursive formula.
###### Problem 8
Finding multiple geometric means between terms in a geometric sequence.
###### Problem 9
Using a geometric sequence to find the depreciated value of a computer after a certain number of years.
###### Problem 10
Finding the first term in a geometric sequence from two other known terms.
###### Problem 11
How to find missing terms in geometric sequences from other known terms.
###### Problem 12
Geometric means as the square root of the product of the terms on either side.