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

Algebra
Tutor: None Selected Time limit: 1 Day

Dec 18th, 2015

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)

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Dec 18th, 2015

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