### Concept (1)

In Algebra, sometimes we have functions that vary in more than one element. When this happens, we say that the functions have **joint variation** or combined variation. Joint variation is direct variation to more than one variable (for example, d = (r)(t)). With combined variation, we have both direct variation and indirect variation.

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Sample Problems
(14)

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###### Problem 1

How to find the sum of a finite geometric series.

###### Problem 2

How to find the sum of an infinite geometric series.

###### Problem 3

How to evaluate a summation notation that yields a geometric series.

###### Problem 4

Geometric series to model repeated investment in an account with known interest.

###### Problem 5

Introduction to infinite geometric sums, including the ideas of convergence and divergence.

###### Problem 6

Using an infinite geometric series to find a swing or pendulum's theoretical total distance.

###### Problem 7

Addressing notation and vocabulary of geometric sequences and series.

###### Problem 8

Using a geometric series to find the total theoretical distance traveled by a bouncing ball.

###### Problem 9

How to use Sigma notation to evaluate a finite geometric series.

###### Problem 10

Finding the term number, n, for a known sum in a geometric series.

###### Problem 11

How to write a decimal that has one digit repeating infinitely as a fraction.

###### Problem 12

Finding infinite geometric sums from sigma notation.

###### Problem 13

Finding a finite sum of a geometric sequence written as a list of numbers.

###### Problem 14

Clarity on notation and formulas of geometric sequences and series.