Pattern Arithmetic and Geometric Sequence

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

• 8

• 11

• -11

• -8

What kind of sequence is the pattern 400, 200, 100, 50, 25, ...?

• Arithmetic

• Geometric

• Neither

What is the common ratio for the sequence:
28, -14, 7, -3.5...

• 1/2 (or 0.5)

• - 1/2 (or -0.5)

• -14

• -7

Find the common ratio of the geometric sequence:      -2, -4, -8, -16, . . . 

• -2

• 2

• 4

• -4

What is the common ratio for the sequence:
3, 15, 75...

• 12

• 1/5

• 5

• 10

What is the common difference or ratio of the pattern 32, 38, 44, 50, 56, ...?

• d = + 6

• d = - 6

• d = - 8

• d =  2

Write a recursive rule for the arithmetic sequence 17, 1, -15, -31 . . .

• a_n = a_n-1 + 16
  a₁=17

• a_n = a_n-1 - 17
  a₁=17

• a_n = a_n-1 - 15
  a₁=17

• a_n = a_n-1 - 16
  a₁=17

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+16
  a₁=6

Write the recursive formula for 17, 33,  49, 65....

• a_n=a_n-1+1
  a₁=17

• a_n=a_n-1-16
  a₁=17

• a_n=a_n-1-1
  a₁=17

• a_n=a_n-1+16
  a₁=17

Is the sequence-4, -12, -36, -108,... arithmetic geometric, or neither?

• arithmetic

• geometric

• neither