Arithmetic/Geometric Sequence and Series

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

• 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

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

• 59048

• -29524

• 524288

• 3069

Which series are Arithmetic? (select ALL that apply)

• 2 + 4 + 8 + 16...

• 7 + 15 + 23 + 31...

• 80 + 68 + 56 + 44...

• 1 + 3 + 7 + 11...

• -10 + (-8) + (-6) + (-4)...

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

• yes

• no

Find the 22nd term of the following arithmetic sequence:

5, 8, 11, ...

• 14

• 68

• 63

• 71

Identify the common difference in the given arithmetic sequence.

10, 20, 30, 40, ...

• 5

• 10

• 15

• 20

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

• 8

• 11

• -11

• -8