NOTE: Your paper has an additional question which is different and it is number 25. The answer is: 6 V because when resistors are connected in parallel, their voltages are equal to that of the source's.
The answer for Question # 26 on your paper is on # 25 on this paper.
" " " " # 27 on your paper is on # 26 on this paper.
" " " " # 28 on your paper is on # 27 on this paper.
The answer for Question # 26 on your paper is on # 25 on this paper.
" " " " # 27 on your paper is on # 26 on this paper.
" " " " # 28 on your paper is on # 27 on this paper.