Decide if each sequence is arithmetic, geometric, or neither. [ Select] Sequence 1: 81, 27, 9, 3, .. Sequence 2: -2, 4, 10, 16, .. [ Select] Sequence 3: 3, -12, 48, -192, ... [Select ] Sequence 4: 1, 2, -4, -8, .. [ Select ]

C. -976,562,500 D. 4,882,812,500 18. A geometric sequence is shown below. 24, 12, 6, ... Which is the explicit formula for this sequence? A. On = 24 O, = 24-n B. C. a, = 24- an = 24- - 24--1 D. 19. The sequence below shows the amount of bacteria that occurs after each hour: 2, 6, 18, 54, 162, ... cms

sequense. (Wa 10. Is there a pair of integers (a, b) such that a, x1, y2, b is part of an arithmetic sequences and a, x2, y2, b is part of a geometric sequence with x1, x2, y1, y2 all integers?

What is the sum of infinity terms for the sequence 24, 12,6, .. ? A. 96 B. 48 C. 60 D. 72