Yes it can tile. * * * * * No, they cannot.
Not by itself.
A regular pentagon is a geometric object that is a plane figure with straight lines. It is a regular polygon with five sides.
No, not if your floor is flat. Regular pentagons do not tile the plane. You will always end up with empty space. You would need to use some other shapes too (or irregular pentagons) http://www2.spsu.edu/math/tile/defs/pentagon.htm