1. 2-1 Write the first five terms of the sequence defined by the explicit formula a, = 112 (1 point ) A O 112, 28, 7, _ 7 7 4'16 O 112, - 28, 7, - 4' 16 O 28, 7, 7 7 7 4 16 64 O 28, -, ' 16' 64 2. Write the first five terms of the sequence defined by the recursive formula a, = 2 (an-1) +4, (1 point) with a = -1. O-1, 3, 7, 11, 15 O-1, -2, -6, -22, -86 O-1, 2, 8, 20, 44 O-1,6, 20, 48, 104[my (112mm) 3' Write the rst ve terms of the sequence in which the nth term is an = )2 + 2 1,1,1,1,1 1, 3, 12, 60, 360 2, 6, 24, 120, 720 2, 4, 6, 8, 10 4. Is the sequence {an} = {1.2, 2.4, 4.8, 9.6, .. .} arithmetic, geometric, or neither? If arithmetic, (I point) identify the common difference, d. If the sequence is geometric, identify the common ratio, r. arithmetic; d = 2 arithmetic; d = 1.2 geometric; r = 2 geometric; r = 1.2 neither Write a recursive formula for the arithmetic sequence { a,} = 3, 11 13 . (1 point) 3' 3 5, Oa = 3, an = -an WINWI- O a = 3, an = - an + W I J W / N W / J WIN Oa = 3, an = an- + Oa = 3, an = an-1 + 6. Calculate as7 for the sequence {an) = -6. - 9 , -3, - 2,0, ... (1 point) N 078 159 O 2 081 O 171 27- Find the rst term of the arithmetic sequence in which (.224 = and the common difference (1 poin 4 . 7* IS . 4 E 4 a 87 129 8. The table shows the predicted growth of bacteria after various numbers of hours. Write an (1 poimj explicit formula for the number of bacteria after n hours. Bacteria a\" = 6m+19 a\" :19): + 25 a\" = 623 + 25 an =1923+6 10. Calculate S31 for the arithmetic sequence in which a9 :1? and the common difference is (I point) =-2.1. -46 -29.2 32.7 71.3 12 . 11' Evaluate Z (2:2 _jr:. _ (11701)\") :'=1 28] 566 1,216 1,293