i think 14 but im not sure..a total guess actually sorry
Two are needed at each end of the prism
24
seven
j
I am not 100% sure but I think the most polygons in it is a hexagon since its a hexagonal prsim....
2 octagons (floor and roof), 8 rectangles (walls).
Take two identical n-sided polygons in parallel planes. Join them together using n rectangular faces. The result will be a right prism.
6 sides are needed
15 straws are needed
It depends on what type of prism you're using (e.g. triangular prism).
15
6