Sequence 2

The first three terms of an arithmetic sequence are 3, 11, and 19. Which function 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

A geometric sequence has as its first three terms 48, 12, and 3. Which function represents the sequence?

• a_n = 48(1/4)^n-1

• a_n = 48 - (n-1)36

• a_n = 48(4)^n-1

• a_n = 3(4)^n-1

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

Write a recursive formula for the following sequence:

10, 5, 0, -5,...

• a₁= 10

  a_n= a_n-1 - 5

• a₁= 10

  a_n= a_n-1 + 5

• a₁= 10

  a_n= a_n (5)

• a₁= 10

  a_n= a_n-1 (5)

What is a formula for the nth term in the sequence 12, 20, 28, ...?