Arithmetic Sequences

Write the recursive formula for 6, 17, 28, 39, 50....

• a_n=a_n-1+11
  a₁=6
• a_n=a_n-1-4
  a₁=6
• a_n=a_n-1+9
  a₁=6
• a_n=a_n-1+6
  a₁=6

Given the recursive formula, find the first four terms:
a_n = a_n-1 + 5
a₁ = -16

• -16, -21, -26, -31
• 5, -11, -27, -43
• -16, -80, -500, -200
• -16, -11, -6, -1

Find the common difference.

Find the common difference.

Find the first five terms.

What is the common difference?
5, 9, 13, ...

• 9
• 5
• 4
• not arithmetic

What is the common difference:

5,11,15,21

• 5

• 6

• Not Arithmetic

• 7

What is the common difference?
15, 9, 3, ...

• 6
• not arithmetic
• (-6)
• 15

What is the explicit formula for the sequence?

6, -14, -34, -54, ....