1.) There are 20 rows of seats in a concert hall: 24 seats are in the 1st row, 29 scats are in the 2nd row, 34 seats on the 3rd row, and so on. a.) Write the explicit formula, an, for the number of scats in each row. b.) Write the first 6 terms in the sequence. c.) Use your formula to determine the number of seats in the 10h row. Show all work.​