Arithmetic and Geometric Sequences

Arithmetic, geometric, or neither?

4, 9, 14, 19, ...

• Arithmetic

• Geometric

• Neither

Arithmetic, geometric, or neither?

100, 50, 25, 12.5, ...

• Arithmetic

• Geometric

• Neither

Find the common difference:

25, 13, 1, -11, ...

• 12

• -12

• 8

• -8

Find the common ratio:

2, 8, 32, 128, ...

• 1/4

• 4

• 1/6

• 6

Create the formula for the geometric sequence:
-4, -16, -64, -256...

• a_n = -4(4)^n-1
• a_n = -4(-4)^n-1
• a_n = 4(4)^n-1
• a_n = 4(4)^n-1

What is the formula for the sequence:

11, 22, 44, 88...

• a_n = 2(11)^n-1

• a_n = 11 + 2(n-1)

• a_n = 11(2)^n-1

What are the first three terms of the sequence defined by the following equation?
a_n = 7 + (n - 1)5

• 7, 35, 175
• 7, 2, -3
• 12, 17, 22
• 7, 12, 17

What is a₅ in the sequence defined as follows?
a_n = 5 ⋅ 2^(n-1) 

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

The Explicit Formula for the Geometric Sequence is: