15. A soccer field has 9 seats in the first row. Each row has 3 more seats than the row in front of it. a ) What type of sequence is represented by the number of seats in the rows? [1 mark] b) Write a general term for this sequence. [1 mark] C) Use your formula to determine how many seats would be in the 12" row. [2 marks] d) The last row has 117 seats in it. How many rows are in the soccer field? [2 marks] . The 5" term of a geometric sequence is 18 and the 9th term is 1458. Find the general term of the geometric sequence. [4 marks]