Geometric Sequences and Series Determine if the sequence is geometric. If it is, find the common ratio, the 8th term, and the explicit formula. 1) -1, -3, -9, -27, ... 2) 2, 2' 8' 32 Common Ratio: r 4 ... Common Ratio: r = 3 1 a = -2187 Explicit: a,: 8192 =-3"-1 Explicit: a = 2. %3D 3) 148, 1488, 14888, 148888, ... 4) 0.75, 3, 12, 48, ... Not geometric Common Ratio: r = 4 a = 12288

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