A pentahedron can be a quadrilateral based pyramid or a triangular prism. A pyramid has only one base and so, since the question specifies "bases", the shape must be the second and so the bases are triangles.
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there are 15 edges in a pentahedron
No. Pentahedron has 5 faces, and Cube has 6.
5, that is what the penta part of pentahedron means.
It has five faces in all. How many are lateral depends on the configuration of the pentahedron.
It is a pentahedron. One example of an irregular pentahedron is the 4-sided pyramid.