Solid has faces that consist of 2 triangles and 3 rectangles. the solid has 9 edges. how many vertices does the solid have?
a.
6 vertices
b.
8 vertices
c.
10 vertices
d.
12 vertices

The formula for this is V+F=E+2 where V is the vertices, F is the faces and E is the edges.
Given that E=9, F=2+3=5 and V=?, the formula is
V+F=E+2
V+F-F=E+2-F
V=E+2-F
V=9+2-5
V=11-5
V=6 
Therefore the vertices are 6.
This method does not apply for all solid shapes.

Same length is comparing because it’s saying its the same and not different

Ithink it’s b because it say 3 plastic rings and all the balls