Sequences Group Quiz

Find the eighth term:

3, 6, 12, 24, ...

What is a₅ for the sequence below?

a_n = 5 ⋅ 2^(n-1) 

• a₅ = 160
• a₅ = 40
• a₅ = 10
• a₅ = 80

Which sequence is a geometric sequence with a common ratio of 2?

• 5, 3, 1, -1, ...

• 5, 7, 9, 11, ...

• 5, 10, 20, 40, ...

• 5, 15, 45, 135, ...

What are the next 3 terms in this sequence of terms?     3, 7, 11, 15

• 18, 22, 26
• 19, 21, 23
• 19, 23, 27
• 18, 21, 24

Find the explicit formula:

3, 6, 12, 24, ...

• aₙ = 6⋅(½)ⁿ ⁻ ¹

• aₙ = 6⋅(½)ⁿ

• aₙ = 3⋅2ⁿ ⁻ ¹

• aₙ = 3⋅2ⁿ

Which kind of sequence has a common difference?

• Arithmetic
• Geometric

• A geometric sequence with a common difference of 3.

• An arithmetic sequence with a common difference of 3.

The first three terms of an a sequence are 3, 11, and 19. Which formula represents the sequence?

• a_n = 8 + 3(n-1)

• a_n = 8(3)^n-1

• a_n = 3 + 8(n-1)

• a_n = 3 + 8n

What is the explicit rule for the sequence? 11, 22, 44, 88...

• a_n = 2(11)^n-1

• a_n = 11(2)

• a_n = 11(2)^n-1

Arithmetic, geometric, or neither?

1, 3, 7, 13, ...

• Arithmetic

• Geometric

• Neither