vertices 14 edges 16 faces ? use Euler's formula.

124
225
323
427

The formula is V - E + F = 2, where V is the number of vertices, E is the number of edges, and F is the number of faces.

Plugging in the given values:
14 - 16 + F = 2
F = 2 + 16 - 14
F = 4

Therefore, the number of faces is 4.