Answer Happy

Write an equation for each of the following sequences. Also determine if the sequence is arithmetic, geometric, or neither: (a) 400, 100, 25, 6.25, 1.5625, ... (b) 1000, 700, 400, 100, (c) 20, (d) 5, 1, 11, 31, 59, 91, ... 200, ... 60, 180, - 540, 1620, ... -