Quiz on Lessons 7-1 to 7-3

To find the next term in a geometric sequence…

• add the common difference d

• multiply by the common ratio r

To find the next term in an arithmetic sequence…

• add the common difference d

• multiply by the common ratio r

-21, -16, -11, -6, ...

Is this sequence arithmetic, geometric, or neither?

• arithmetic

• geometric

• neither (no common difference or common ratio)

3, 9, 15, 22, ...

Is this sequence arithmetic, geometric, or neither?

• arithmetic

• geometric

• neither (no common difference or common ratio)

Given where a₁ = 3 and a_n = 5a_{(n - 1)}

What are the first three terms in the sequence?

• 3, 15, 45

• 5, 8, 11

• 5, 15, 45

• 3, 15, 75

Given the function f(n) = f(n − 1) + 9, where f(1) = 4

What are the first three terms in the sequence?

• 4, 36, 324

• 4, 13, 22

• 9, 13, 17

• 4, 8, 12

Write the explicit formula for the sequence shown below.

1, 6, 11, 16

• a_n = 1 + 5(n − 1)

• a_n = 1 − 5(n − 1)

• a_n = 5 − (n − 1)

• a_n = 5 + (n − 1)

What is the 20^th term of the arithmetic sequence shown below.

7, 4, 1,...

• -49

• 50

• -50

• -51

What is the fifth term of the geometric sequence?

5, 15, 45,...

• 135

• 1875

• 1215

• 405

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

• a_n = a_{n - 1} + 9

  a₁ = 6

• a_n = 11 a_{n - 1}

  a₁ = 6

• a_n = a_{n - 1} + 11

  a₁ = 6

• a_n = a_{n - 1} + 11

  a₁ = 1