1. An auditorium has 2D seats in the 15t row, 24 seats on the second row, 28 seats on the third row, and so on up to the 20th row.. How many seats are there in the last row? How many seats are there in the auditorium? 2. How many poles will be in a pile ifthere are 50 in the rst layer, 4-9 in the second, and so on..., until there are 6 poles in the last layer. 3. A man started to work in 1985 at an annual salary of?185,00{}. He received a F15, DUO raise each year through 2000. What were his total earnings for the given period? 1. Find the 12th term of the arithmetic sequence 2, 6, 10, ... 2. Find the 17th term of the arithmetic sequence 7, 4, 1, ... 3. Find the sum of all the multiples of 7 from 7 to 98, inclusive 4. Find the sum of all the multiples of 4 between 14 and 523. 5. Given the arithmetic sequence 3, WIN WILT . . . . Find: a. the 14th term b. sum of the first 14th term