Arithmetic Sequences and Series and Geometric Sequences

What kind of sequence is illustrated below?
 400, 200, 100, 50, 25, ...

• Arithmetic
• Geometric
• Neither

Which kind of sequence has a common difference?

• Arithmetic
• Geometric

What is the 8th term in the sequence below?
3, 9, 27, 81, ...

• 19,683
• 6,561
• 2,187
• 729

The next term of the series 11,8,5,2 is...

• -1
• -2
• 1
• 2

Is this sequence arithmetic, geometric, or neither?
{26, 22, 18, 14, ...}

• Arithmetic
• Geometric
• Neither

Is the sequence arithmetic: 78, 785, 7855, 78555, ...

• Yes
• No

Is the sequence 2, 4, 12, 48,... geometric?

• yes
• no

Evaluate the Arithmetic Series

• 105

• 210

• 100

• 420

Find the sum of the infinite geometric series, if it exists:

5 + 4 + 3.2 + 2.56 + ...

• 25

• 5

• -1

• 0.8

Determine whether the sequence could be geometric or arithmetic:

6, 10, 15, 21, ...

• Geometric with r = 5/3

• Arithmetic with d = 4

• Geometric with r = 4

• Neither