What is the 9th term of the geometric sequence with first term 5 and common ratio 2?
A)5
B)640
C)32,805
D)2,560
E)1,280

Name: What is the 9th term of the geometric sequence with first term 5 and common ratio 2? A)5 B)640 C)32,805 D)2,560 E)1,280
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Question

What is the 9th term of the geometric sequence with first term 5 and common ratio 2? ​
A)5
B)640
C)32,805
D)2,560
E)1,280

Quizplus · Accepted Answer

The nth term of a geometric sequence with first term $a$ and common ratio $r$ is $a\cdot r^{n-1}$. Therefore, the ninth term of the given sequence is $5\cdot2^{8}=1,280$. Thus, the answer is $\boxed{	extbf{(E)}}$.

What Is the 9th Term of the Geometric Sequence with First