The table below shows the February balance of a simple interest savings account each year from 2015 to 2021 Year 2015 2016 2017 2018 2019 2020 2021 Balance

$12,000 14018 16036 18054 20072 22090 24108

Do the balances form an arithmetic or geometric sequence? What is the d or the r? Write a formula for the balance in the account n years after February 2015. Find the sum of the February balances from 2015 to 2032, inclusive.