Finding Values in Arithmetic and Geometric Sequences

In a geometric sequence, a₄ = 18, a₅ = 6, and a₆ = 2. What is the explicit formula for this sequence?

• a_n = 2(3)^n-1

• a_n = 18(3)^n-1

• a_n = 18(1/3)^n-1

• a_n = 486(1/3)^n-1

Is this sequence arithmetic, geometric, or neither?
{26, 22, 18, 14, ...}

• Arithmetic

• Geometric

• Neither

What is the common difference in this sequence?
{48, 32, 16, 0, ... }

• 1/2

• 2

• -8

• -16

Is this sequence Arithmetic, Geometric, or Neither?
{14, 22, 30, 38, .. }

• Arithmetic

• Geometric

• Neither

What kind of sequence is illustrated below?
 400, 200, 100, 50, 25, ...

• Arithmetic

• Geometric

• Neither

Which kind of sequence has a common difference?

• Arithmetic

• Geometric

What is the common ratio of the geometric sequence below?
5, 25, 125, 625...

• 25

• 20

• 5

• 4

What is the common difference of the arithmetic sequence below?
-6, -1, 4, 9...

• 5

• -5

• -6

• 1/5

What is the common difference:
-2, -11, -20, -29...

• Every Number

• 9

• -9

• -2

What is the common ratio in this sequence? 
{96, 48, 24, 12, ... }

• 1/2

• 2

• 12

• 24