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Write the first four terms of the sequence defined by the 2+ an-1 . /(5 pts) recursive formula a] = -14 an 2Is the sequence 1, 5, 9, 13, 17, 21, ... arithmetic? If so, find the common difference. /(5 pts)\f\fYou have been asked to set up chairs for the school concert. The rst row will have 10 seats, and each additional row has 4 seats more than the previous row. /(10 pts) How many seats are there in row 20? You have been asked to set up chairs for the school concert. The rst row will have 10 seats, and each additional row has 4 seats more than the previous row. f(10 pts) What is the total number of chairs needed to set up 25 rows? A community baseball stadium has 10 seats in the rst row, 13 seats in the second row, 16 seats in the third row, and so on. There are 56 rows in all. What is the seating capacity of the stadium? /(10 pts)