Arithmetic Sequence Equations

Identify the common difference.

• 4

• 3

• -4

• -3

What does a₁ represent?

• Any term

• First term

• Last term

• 16

• 23

• 4

• 30

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)

Write the recursive formula for the following sequence?
6, 4, 2, 0, . . .

• a_n = -2n + 8

• a₁ =6, a_n = a_n - 1 - 2

• a₁ = 6, a_n = a_n-1 + 2

• a₁ = 6, a_n = a_n-1 - 2

Arithmetic sequences involve

• multiplication and division

• multiplication and addition

• addition and subtraction

• subtraction and division

Which is an arithmetic sequence?

• 1, 3, 5, 7, 9, ...

• 1, 2, 4, 8, 16, 32, ...

• 1, 1, 2, 3, 5, 8, 13, ...

An arithmetic sequence is given below.

2, 9, 16, 23, ...

Which is the explicit formula for the n^th term a_n?

• a_n = 9 + 2(n-1)

• a_n = 2 - 9(n-1)

• a_n = 2 + 7(n-1)

• a_n = 7 + 2(n-1)

Which of the following equations is the rule for this sequence: 6, 11, 16, 21, . . .

• a_n = 6 + 5(n - 1)

• a_n = 4 + 6(n - 1)

• a_n = 6 - 4(n - 1)

Find the 25th term of the sequence if a₁ = 5 and d = 0.5

• 18

• 17

• 15

• 14