Series and Sequences

What is the common difference?
5, 9, 13, ...

• 9
• 5
• 4
• not arithmetic

Find the common ratio of the geometric sequence:

64, - 16, 4, - 1, ...

• r = - 8

• r = - 1/4

• r = - 4

• r = 4

Find the common ratio of the geometric sequence:

4, -16, 64, -256, ...

• r = - 4

• r = 2
• r = - 2

• r = 4

• 44

• 43

• 49

Evaluate the infinite series described: 

• 20/3
• No Sum
• 21/5
• 4/3

• 8

• 8/5

• 10

• Does not exist

• 4/5

• 5

• 6.5

• Does not exist

Find the sum of the geometric series.

2 + 12 + 72 + 432

• 432

• 518

• 211

• 438