An octagonal prism has 16 vertices.
It is not a prism, and there is no such thing as a prisam.
A pentagonal prism has 15 edges.
The octagonal pyramid has 9 vertices.
It has eight faces, hence the name octagonal pyramid.
Yes.
Not sure about vertacies, but there are 6 vertices on a hexagon.
Assuming that vertacies is your attempt to spell vertices, the number of vertices in an octahedron can range from 6 to 12.
It is not a prism, and there is no such thing as a prisam.
A triangle has no prisms.
10.
A triangular prism has 5 faces.
A rectangular prism has 6 faces.
A triangular prism has 9 edges.
An octagonal shape has 8 sides
A rectangular prism has 8 vertices.
A pentagonal prism has 15 edges.
"Octagonal" is an adjective. That is not enough information. Is it an octagonal prism, octagonal pyramid, octagonal bipyramid or something else? Each one would lead to a different answer.