Geometric Sequences

Write the explicit formula for the geometric sequence.

• a_n = 7(1)ⁿ
• a_n = 7(-1)ⁿ
• a_n = 7(-1)^n-1
• a_n = -1(7)^n-1

Write the explicit formula for the geometric sequence.

• a_n = 4(3)^n-1
• a_n = 3(4)^n-1
• a_n = -4(3)^n-1
• a_n = 3(-4)^n-1

Find the common ratio for the geometric sequence.

• 2/3
• 3/2
• -2/3
• -3/2

A sequence follows the given recursive rule where  $a_1=17$  . Find the 6th term.

•  $272$  

•  $-544$  

•  $7$  

•  $-34$  

Find the term named in the problem.

• A

• B

• C

• D

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• 
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The rule for finding a_n of a geometric sequence is

a_n = 10(2)^n-1 _{What is the common ratio(r) of the sequence?}

• ²

• ¹⁰

• ²⁰

• 2ⁿ

A geometric sequence has a common ration(r) of 2 and the 13th term (a₁₃) is 36,864. What is the first term of the sequence (a₁)?

• 3

• 9

• 18

• 6

Find the missing term of the geometric sequence: 45, ______, 1620

• 9720
• 51
• 6
• 270