The question describes a situation where we must use arithmetic sequences. The first row of the music stadium has 18 seats. In terms of sequences, it means . Then we know each additional row has 3 more seats than the previous one. It gives us the common difference r=3.
(a) The expression for the n-th row will be given for the general term of an arithmetic sequence as follows (n>=1):
what you got to do is you have to pee X 2 which which will give you an answer and you will subtracted by 4 + 485 which will give u p xthen you have your answer you can do it backwards like pee times 485 + 14 * -2 equals P x