[填空题]
In an arithmetic seqt 61thy k5z+ kuvgh(w4uence, the sugsp ksq4to;l, j8q0 a qv(k10lvv 5: z*zbmvs*m of the 2 nd and 6 th term is 32 .
Given that the sum of the first six terms is 120 , determine the first term and common difference of the sequence.An arithmetic sequence has first term 45 and common difference -1.5 .
1. Given that the k th term of the sequence is zero, find the value of k .
Let $S_{n}$ denote the sum of the first n terms of the sequence.
2. Find the maximum value of $S_{n}$ .
