Sequence review

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

• 64
• 32
• 108
• 20

Which of the following is not an arithmetic sequence?

• 1/2, 1, 3/2, 2

• 11, 14, 17, 20

• 2, 4, 8, 16

• 5, 2, -1, -4

Write the explicit formula for the sequence shown below.

3, -3, -9, -15

• a_n=3+6(n-1)

• a_n=3−6(n-1)

• a_n=6−3(n-1)

• a_n=6+3(n-1)

An arithmetic sequence is described by the function f(n)=−3n+7. What are the first 5 terms of the sequence?

• 7, 10, 13, 16, 19

• 4, 1, -2, -5, -8

• -4, -1, 2, 5, 8

• -7, -10, -13, -16, -19

Is the sequence arithmetic: 37, 31, 25, 19, ...

• Yes
• No

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

• 8
• 11
• -11
• -8

Write a formula for the following sequence:

4, 12, 36, 108...

• a_n = 4(3^n-1)

• a_n = 4(3ⁿ)

• a_n = 4+3n

• a_n = 4(3n)

What is the 100th term in the sequence a_n = 4n-12

• 388

• 40012

• -388

• 100

Given a₁= 5 and d= 2 find a₆

• 13
• 10
• 15
• 17

Find a₁₈ for the following geometric sequence,

-3, 6, -12, 24,,,

• -37

• -786,432

• 393,216

• 258,280,326