Unit 9 Sequences and series

Identify the common difference.
97, 86, 75, 64, ...

• 8
• 11
• -11
• -8

The next term of the sequence 2,4,8,16 is

• 64

• 32

• 108

• 20

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

• Yes
• No

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

• yes
• no

What is the common ratio for the sequence:
28, 14, 7, 3.5...

• 2
• 1/2
• -14
• -7

-21, -16, -11, -6, ...

Is this sequence arithmetic, geometric, or neither?

• arithmetic (common difference d = 5)

• geometric (common ratio r = 5)

• neither

Find the 22nd term of the following sequence:
5, 8, 11, ...

• 14
• 68
• 63
• 71

Find the 32nd term of this sequence.
34, 37, 40, 43, ...

• 32
• 64
• 127
• 356

What is the sum of the first 10 terms for the following geometric series:
2-6+18-54+...

• 59048
• -29524
• 524288
• 3069

What is the value of r for the following sequence.
1/2+1/4+1/8+1/16+...

• 2
• -2
• 1/2
• -1/2