Select the correct way to simplify: (6)56×(6)13
(6)76
(6)518
(6)69
(36)76
(3a2)34=
334a54
334a32
3a114
3a32
(5y)-4=
1(5y)4
15y4
-20-4y
5y4
(2+3)-211(2+3)-2=
11
111
15
155