For each sequence, find a formula for the general term, . For example, answer if given the sequence:

1.really to sure about this one

2.in this one I see the pattern that 1/4 is half of 1/2 and 1/8 is half of 1/4 and 1/16 is half of 1/18 but I just can't seem to figure out the formula to show this

And the next question is

For the sequence

its fifth partial sum .

its th partial sum .

Any explanation into what exactly is being asked would be great I went back to my chapter twice and still can't figure out the partial sum part of sequeneces

Thanks Guys