# Need algebra help with Arithmetic and geometric sequences: Identifying and writing an explicit rule

Anonymous
timer Asked: Dec 18th, 2015
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### Question Description

Robert11
School: New York University

Thank you for the opportunity to help you with your question!

7,11,15...

type

arithmetic sequence

an = a1 +(n-1)d

here

a1= 7

d=4

so

an= 7+(n-1) *4

an= 4n+3

8,40,200...

type

geometric sequence

an =a1 * r^(n-1)

a1= 8

r= 40/8 = 5

an = 8 * 5^(n-1)

Please let me know if you need any clarification. I'm always happy to answer your questions.

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Anonymous
Good stuff. Would use again.

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