Arithmetic Series

Find the sum of the arithmetic series: 20 + 30 + 40 + 50 + ... n = 15

Find the sum of the arithmetic series: (First Term: -18, Last term: -102, n = 13)

Find the sum of the arithmetic series: 7 + 9 + 11 + 13 + ... n = 10

Find the sum of the sequence: 39, 49, 59, 69

Find the sum of the arithmetic series: 10 + 12 + 14 + 16 + ... n = 11

Find the sum of the arithmetic series: (First Term: 4, Last term: 22, n = 10)

Find the sum of the sequence: 22, 28, 34, 40, 46

Find the sum of the arithmetic series: (First Term: 42, Last term: 146, n = 14)

Find the sum of the arithmetic series: (First Term: 2, Last term: 122, n = 13)

Find the sum of the sequence: 6, 11, 16, 21, 26, 31, 36

Find the sum of the sequence: 13, 15, 17, 19, 21, 23

Find the sum of the arithmetic series: 20 + 27 + 34 + 41 + ... n = 16