1) How many 6-letter subsets can you make if 2 are consonants and 4 are vowels"
The problem is not clearly stated.
It says subsets, so the order of the letters is not considered.
If letters may not be repeated in the subsets,
. . there are: . choices for the consonants
. . and choices for the vowels.
There are: . possible subsets.
If letters may be repeated, it is a very messy problem . . .