Answer:
1.A= {a,e,i,o,u}
2. {x:x is a vowel in the english alphabet}
3-5. {a,e,i,o,u}
6. |A|= 5
7-8.{i,u,o,a,e}
{o,i,u,e,a}
{u,i,e,a,o}
9-11. {1,2,3,4,5}
{january,February,march,april,may}
{A,B,C,D,E}
12-18.
A= {a}, {e}, {i}, {o}, {u}
{a,e}, {a,i}, {a,o},{a,u},{e,i}, {e,o},{e,u}, {i,o}, {i,u},{o,u}, {a,e,i}, {e,i,o},{i,o,u},{a,i,u}, {e,u,a}, {i, a,u} {a,e,i,o,u}
19-25
{}, {a}, {e}, {i}, {o}, {u}, {a,e}, {a,i}, {a,o},{a,u},{e,i}, {e,o},{e,u}, {i,o}, {i,u},{o,u}
Step-by-step explanation: