Question

One year after Sarah started a new job, she had $1200 in her savings account. Each year, she added $900 more to the savings account.

What function, written in sequence notation, models Sarah’s savings account balance n years after starting her new job?




an=300n+1200


an=900n+300


an=300n+900


an=900n+1200

Answer 1

an=900n+300

Explanation:

took test

Answer 2

`a_n=300+900n`

Explanation:

we are given

One year after Sarah started a new job, she had $1200 in her savings account

so, first term is 1200

`a_1=1200`

Each year, she added $900 more to the savings account

so, common difference is 900

`d=900`

Since, it is arithematic sequence

so, we can use nth term formula

`a_n=a_1+(n-1)d`

now, we can plug values

`a_n=1200+(n-1)* 900`

`a_n=1200+900n-900`

`a_n=300+900n`