Algebra help with arithmetic and geometric sequences: Identifying and writing an explicit rule

Algebra
Tutor: None Selected Time limit: 1 Day

Dec 18th, 2015

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4,12,36...

type

geometric sequence

an =a1 * r^(n-1)

a1= 4

r= 12/4 = 3

an = 4 * 3^(n-1)



14,21,28...

type

arithmetic sequence

an = a1 +(n-1)d

here

a1= 14

d=7

so

an= 14+(n-1) *7

an= 7n+7


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Dec 18th, 2015

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