Which sequence notation represents (10, 20, 40, 80, 160, ...)?

Fill in the blank:

The sequence notation for the terms of sequence(1, -2, 4, -8, 16, ...) is ________.

Which sequence notation represents (6, 3, 0, -3, -6, ...)?

Fill in the blank:

The sequence notation for the terms of sequence (13, 16, 19, 22, 25, ...) is ________.

Which sequence notation represents (1, ½ , 1/3 , ¼, 1/5, …..)?

Which sequence notation represents (1/2, ¼, 1/8, 1/16,…)?

Which sequence notation represents(9, 16, 25, 36, 49, ...)?

Which sequence notation represents(7, 14, 28, 56, 112, ...)?

Which sequence notation represents(1, 2, 4, 8, 16, ...)?

Which sequence notation represents (2, 4, 6, 8, 10, ...)?