Geometric Sequences

Is the sequence 7, 9, 12, 16,... geometric or arithmetic?

• arithmetic

• geometric

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

• r = -4
• r = 2
• r = -2
• r = 4

Tags

CCSS.HSF.BF.A.2

Find the common ratio: -3, -9, -27, -81, ...

• r = 6
• r = -6
• r = 3
• r = -3

Tags

CCSS.HSF.BF.A.2

What is the explicit rule for the sequence:

11, 22, 44, 88...

• a_n = 2(11)ⁿ

• a_n = 11x2

• a_n = 11(2)ⁿ

Tags

CCSS.HSF.BF.A.2

What is the 7 term for the rule:

f(n) = 3(0.8)ⁿ

• 0.786

• 0.629

• 14.4

• 2.4

Tags

CCSS.HSF.BF.A.2

Given the recursive formula, find the first four terms:

a_n = a_n-1⋅-3

a₁ = 45

• 45, -135, 405, -1215

• -45, -135, -405, -1215

• 45, 135, 405, 1215

• 45, 42, 39, 36

Tags

CCSS.HSF.BF.A.2