Answer:
Vertices: 17
Explanation:
Given the statement:
Here, E represents the number of Edges , F represents the number of Faces and V represents the number of vertices
then;
Edges(E) = 33 
Faces(F) = 18 
We have to find number of vertices. 
Using Euler’s Formula 
F + V = E + 2:
then;
18+V= 33+2
⇒18+V = 35
Subtract 18 from both sides we have;
V = 17
Therefore, the number of vertices = 17