math
posted by jeng on .
Use Eulerʹs formula to answer the question.
A polyhedron has 36 edges and 21 faces. How many vertices does it have?

ummmm
you cant post yr whole homework assignment on here.... 
I believe Euler's Formula dealing with polyhedra says
V  E + F = 2
Don't you know 2 of those variables ? 
thank you for helping me Reiny that's what i was trying to find was the formula and i couldn't remember it. I was not trying to post my whole assignment on here they are example questions from the text that im trying to figure out.