Question

Are these logically equivalent (please explain why or why not):
Statement (Conditional): If I get an A on my math homework, then Dr. Madness will be defeated.
Code #1 (Inverse): If I do not get an A on my math homework, then Dr. Madness will not be defeated.
Code #2 (Converse): If Dr. Madness is defeated, then I got an A on my math homework.
Code #3 (Contrapositive): If Dr. Madness is not defeated, then I did not get an A on my math homework.
**I got the rest of my work done but this part confuzzled me, lol. Please help.?