Geometric and AROC

Is the sequence -4, -12, -36, -108,... geometric?

• yes
• no

Find the common ratio: 4, -16, 64, -256, ...

• r = -4
• r = 2
• r = -2
• r = 4

Find the next three terms: 4, 12, 36, 108, ...

• 324, 972, 2916
• 972, 2916, 8748
• 405, 1215, 3645

What is the explicit formula for the following sequence: 3, -1, 1/3, -1/9,... 

• a_n = 1/3 ⋅ (3)^n-1
• a_n = 3 ⋅ (1/3)^n-1
• a_n = 3 ⋅ (-1/3)^n-1
• a_n = -1/3 ⋅ (3)^n-1

Find the value of a₉ for the explicit formula: a_n = 4 ⋅ (3)^n-1

• 26,244
• 8748
• 19,683
• 78,732

Find the value of a₇ for the formula:
a_n = 3⋅(-3/2)^n-1

• 33.98
• 34.17
• 51.26
• 48.23

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

• $50
• $35
• $320
• $250

Which sequence is represented by the equation 2(7)^n-1 ?

• 7, 14, 28, 56...
• 2, 14, 98, 686...
• 2, 9, 16, 23...
• 7,9,11,13...

Which kind of sequence has a common difference?

• Arithmetic
• Geometric

Arithmetic Sequences have a common...

• ratio
• difference