Question

Bryce started with $450 in a bank account that does not earn interest. In the middle of every month, he withdraws 13 of the account balance.

Which recursive function rule models Bryce’s balance at the end of each month?



an=450⋅an−1 and a1=13

​ an=13⋅an−1 ​ and a1=450

an=23⋅an−1 and a1=450

an=450⋅an−1 and a1=23

Answer 1

Because Bryce started off with $450 then his a1 should be $450. Then, the amount of money he will have after n months is,
an = 13(an-1)
where an is the amount of money he has and an-1 is the amount of money he has in his account from the month prior.