4
Infinitely many.
A rectangular prism that is 4 cubes by 2 cubes is made up of 8 cubes.
8
24 of them
The answer depends on the number. Note that the question does not require the solids to be in the form of cubiods (rectangular prisms).
Some words that can be made from 'solids' are:Iidisdolidlossoiloldslidsosoilsold
13
4
You can make four.
93
3
Infinitely many.
You could try 14!
A rectangular prism that is 4 cubes by 2 cubes is made up of 8 cubes.
8
about 10