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

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

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

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

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

Fill in the blank:

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

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

Fill in the blank:

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

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

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