Question

Jobie starts with $325 in her piggy bank. Each month she adds $10.

Answer 1

I think it is the fourth one

Answer 2

A recursive formula represent the nth terms of a sequence in terms of it's previous (n-1)th term and it include first term.

Let's assume,

$a_{1}$ = First term,

$a_{n}$ = nth term,

$a_{n-1}$= Previous term of nth term or (n-1) the term.

According to the problem,

Jobie starts with $325 in her piggy bank. Each month she adds $10.

Which means first term: $a_{1} = 325$

Since he is adding $10 each month. So, this month if he will have $a_{n-1}$ then in the next month he will have $10+a_{n-1}$.

So, the recursive formula will be ,

$a_{n} =10+a_{n-1} , a_{1} =325$