Which of these mappings is a function? Х
у
х
y
Х
y
Х
y
5
- 2
5
2
5
2
5
2
6
4
6
4
6
A4
6
4
7
4
6
7
6
7
- 6
7
6
8
8
8
8
8
8
8
8
W.
X.
Y.
Z.
OA w

If the perimeter of the square equals the perimeter of the regular pentagon. each side of a pentagon is 16cm long. how long is each side of the square?