Linear Arithmetic Sequences

Identify the first term: 
28, 24, 20, 16, ...

• 4
• -4
• 28
• 16

Identify the common difference: 
28, 24, 20, 16, ...

• 4
• -4
• 28
• 16

Identify the d. 
-7, -1, 5, 11, ...

• -7
• -1
• 5
• 6

Identify the a₁. 
-7, -1, 5, 11, ...

• -7
• -1
• 5
• 6

Given the function a_n=a_n-1 + 3 with a first term of 10, what are the first 4 terms? 

• 19
• 1
• 10, 13, 16, 19
• 10, 7, 4, 1

Given the function a_n = 2n - 7, what is the 8th term? 

• 5
• 8
• 1
• 9

Write the explicit formula: 
17, 26, 35, 44, ...

• a_n = 26 + 9n
• a_n = 25 + 10n
• a_n = 17 + 9n
• a_n = 8 + 9n

Write the recursive formula: 
-3, -9, -15, -21, ...

• a_n = a_n-1 - 6, a₁=-5
• a_n = a_n-1 - 6, a₁=-11
• a_n = a_n-1 - 6, a₁=-3
• a_n = a_n-1-4, a₁ = -11

Write the recursive formula: 
13, 22, 31, 40, ...

• a_n = a_n-1 + 11, a₁ = 13
• a_n = a_n-1 + 9, a₁ = 31
• a_n = a_n-1 + 9, a₁ = 22
• a_n = a_n-1 + 9, a₁ = 13

Write the explicit formula: 
25, 21, 17, 13, ...

• a_n = 27 - 4n
• a_n = 29 - 4n
• a_n = 25 - 2n
• a_n = 21 + 2n