Explicit and Recursive Review

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

What is the 15th term of the sequence an = -3n+50

• 95
• -5
• 5
• -95

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)

Which of the following equations is recursive?

• f(n) = f(n-1) +4
• f(n) = 2n - 5

What does a₁ represent?

• Any term

• First term

• Last term

• 16

• 23

• 4

• 30

Write a sequence to represent the number of smiley faces in each group. Select all that apply.

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

• 2
• 1/2
• -14
• -7

2, 5, 8, 11, 14

What's the recursive equation?

• f(n) = 3n -1

• f(n) = n + 3

• f(1) = 2; f(n) = f(n-1) +3

2, 5, 8, 11, 14

What's the explicit equation?

• f(n) = 2 + 3(n-1)

• f(n) = n + 3

• f(n) = f(n-1) +3

• f(n) = f(n+3)