1. Find the next two numbers in each sequence. A) -1, 1 , 3 , 7 , 15 , B) 3, 1, 2 , -1, 3 , -4, C) 16, 24, 36 , 54 , 81 2. Determine t3 , t4 , and ts for the recursion formula listed below. A) t1 = 1, t2= 3, tn =2 tn-1 - 3tn-2 . B) t1 = 4, t2= 3, t3= 2, tn=( tn-3 + tn-2)x tn-1 3. Find S20 for each arithmetic series listed below. A) 70 + 66 + 62 + 58 ... B) 3 +9 + 15 + 21... C) 9 + 16 + 23 D) 3 + 2.5 + 2 + 1.5 4. Determine S20 for the arithmetic series with properties listed below. A) a = 2x and d = 5x , B) t14- 46, and t19- 100 5. Determine the sum of the arithmetic series -45 - 42 - 39 . . . 15. 6. Find the sum indicated for each of the geometric series listed. A) -16 - 8 - 4 - ..., find Sg B) 3 + 9 + 27 + ..., find S10 C) 16 - 8 + 4 - ..., find S7 D) 3 + 1.5 + 0.75 + ..., find S6 7. Determine S6 for the geometric series with properties listed below A) a = 5 and r = 10, B) t4= 6, and to= 24 8. Determine the sum of the geometric series 3 + 6 + 12 + . . . + 768