Unit 6 Quiz

Determine whether the sequence is an arithmetic sequence. If it is, state the common difference.

5, 0, -5, -10

• yes, -5

• no

• yes, 3

• yes, 4

Determine whether the sequence is an arithmetic sequence. If it is, state the common difference.

2.6, 4.2, 3.1, 2.4, ...

• yes, 1.6

• yes, -0.7

• yes, -1.1

• no

Find the next term in the geometric sequence.

8, -32, 128, -512, ...

• 2,048

• -399

• -544

• -516

The first term of a geometric sequence is 80 and the common ratio is 0.5. What is the 6th term of the sequence?

• 2.5

• 1.25

• 40

• 82.5

Determine whether each sequence is arithmetic, geometric, neither, or both.

200, 40, 8, ...

• arithmetic

• geometric

• neither

• both

Determine whether each sequence is arithmetic, geometric, neither, or both.

2, 4, 16, ...

• arithmetic

• geometric

• neither

• both

Write an equation to describe the sequence.

-10, -2, 6, ...

• a_n=8n - 18

• a_n=8n - 2

• a_n=8n - 11

• a_n=8 + (n - 1)(-10)

Write an equation to describe the sequence.

-12, -24, -48, ...

• a_n = -12 + (n - 1)(-12)

• a_n = -12(2)^n-1

• a_n = -12(2)ⁿ

• a_n = 2(-12)^n-1

Fill in the missing term.

-4, 12, -36, _____, -324, ...

• 108

• -108

• -20

• -44

• 96

Fill in the missing term.

-9, -2, ____, 12, ...

• 2

• 6

• 4

• 5