Complete the recursive rule and an explicit rule for the arithmetic sequence described by the table.
Month n. 1. 2. 3. 4. 5.
Account Balance f(n) 35 30 25 20 15
f（1）=
The common difference is
The recursive is f(1) =
, f(n)= f(n-1)- for n
The explicit rule is f(n) = -
(n-1).