Wind is the answer to this.
18
Explanation:
B is the vertex angle of isosceles triangle. So AB = BC and base side is AC.
As AB = BC
So,
5
x
−
28
=
2
x
+
11
5
x
−
2
x
=
28
+
11
3
x
=
39
x
=
39
3
=
13
AC =
x
+
5
= 13 + 5 = 18
D. this is because when someone shows you a model of a cell, it is a diagram (typically) showing you the composition of it so that you can get a better idea of what the cell is and what the cell does.