13. = 150 and = -5 14. = 2, = a10 d a2 r Write a rule for the nth term of the arithmetic sequence given two terms. 15. = 240, = 170 16. = 6, = 7 a20 a15 a16 a20 Write a rule for the nth term of the geometric sequence given two terms. 17. = 36, = 576 18. = 4, = a2 a4 a2 a5 Find the sum of the following arithmetic series. 19. 3 + 6 + 9 + 12 + 15 + 18 +... ; = 25 20. -1 + 2 + 5 + 8 + 11 + 14 + ... ; = 20 n n
13. a10 = 150 and d = -5 14. a2 = 2, r = Write a rule for the nth term of the arithmetic sequence given two terms. 15. a20 = 240, a15 = 170 16. a16 = 6, a20 = 7 Write a rule for the nth term of the geometric sequence given two terms. 17. a2 = 36, a4 = 576 18. a2 = 4, a5 = Find the sum of the following arithmetic series. 19. 3 + 6 + 9 + 12 + 15 + 18 +... ; n = 25 20. -1 + 2 + 5 + 8 + 11 + 14 + ... ; n = 20
12.2_-_12.3_Practice_Worksheet.docx