II. Find the sum of the following geometric sequence. Use the space below for your solutions in each item.
1. First 20 terms of -1, -2, -4, -8,... 2. Sum of 9, 18, 36, 72,... 3. First 12 terms of 9, 36, 144, 576, ... 4. First 8 terms of 27, 3, 1/3, 1/27, ... 5. Sum of -27, 9, -3, 1, ...
