Sequences and Series

Identify the common difference.
97, 86, 75, 64, ...

• 8
• 11
• -11
• -8

Is the sequence arithmetic: 78, 785, 7855, 78555, ...

• Yes
• No

The next term of the sequence 2,4,8,16 are

• 64
• 32
• 108
• 20

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

• 2
• 1/2
• -14
• -7

Is the sequence 2, 4, 12, 48,... geometric?

• yes
• no

You have $10 in you bank account.  It doubles every month.  How much money will you have after 5 months?

• $50
• $35
• $320
• $250

What is the explicit function for:
4, 7, 10, 13...

• f(n)=4(n-1)+3
• f(n)=3(n-1)+4
• f(n)=4(n-1)+13
• none of the above

What is the explicit rule for:
-12, -23, -34, -45...

• f(n)=-12(n-1)-11
• f(n)=11(n-1)+12
• f(n)=-11(n-1)-12
• f(n)=-11(n-1)+12

What is the recursive form of the sequence below?
5, -3, -11, -19

• A₁=5,  A_n=A_n-1+8
• A₁=5,  A_n=A_n-1-8
• A₁=8,  A_n=A_n-1+5
• A₁=-8,  A_n=A_n-1-5

What is the recursive formula that represents this sequence:
2, 8, 14, ...

• a_n = 2(6)^n-1
• a_n = 2 + 6(n-1)
• a_n = a_n-1 + 6
  a₁ = 2
• a_n = 6*a_(n-1)
  a₁ = 2