Find the next three terms of each arithmetic sequence. 1.) 3, 6, 9, 12, 15, ... 2.) -5.5, -5.9, -6.3, -6.7, -7.1, ... 3.) 15, 11, 7, 3,-1, ... 4.) 266, 282, 298, 314, 330, ... 5.) 3 1 5 9 13 4 4 4 4 4 6.) 3V5,815, 13V5, 18V5, 2315 7.) 6.2, 6.5, 6.8, 7.1, 7.4, ... 8.) -21, -14, -7,0, ...​