Unit 4B Test Review

Identify the common difference. 
10, 20, 30, 40, ...

• 5
• 10
• 15
• 20

Is the sequence arithmetic?

17, 9, 1, -7, ...

• Yes

• No

Select the explicit rule that represents the sequence.

Given the sequence:
 25, 21, 17, 13,...
Write the explicit equation that models the sequence.

• a_n = 4n + 29
• a_n = -4n + 25
• a_n = -4n + 29
• a_n = 4n + 25

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

• 8
• 11
• -11
• -8

Find the next three terms in the arithmetic sequence:

-33, -24, -15, -6, ...

• -1, 7, 15

• -5, 2, 9

• 3, 12, 21

• -65, -73, -81

Is the sequence arithmetic?

78, 785, 7855, 78555, ...

• Yes

• No

Identify the next two terms of the sequence:

4,7,10,13,...

• 16 and 19

• 15 and 19

• 16 and 18

• 15 and 18

Select the explicit rule that represents the sequence.

Find a₂₀ in the arithmetic sequence: (Hint: Find explicit formula first)

5, 12, 19, 26...

• 145

• 144

• 142

• 138