Term Test II

I know I didn't do so well on the term test, I starting working on the first problem and thought I was making some reasonable headway by the time I got to the third problem I realized I was making a crucial mistake, so I backtracked and redid the first problem then I tried correcting the second problem but by that time I was running out of time. I figured cross out what I put on the last question and write "Did Not Know" to salvage some marks and I ended up leaving the second question incomplete. Wasn't my finest moment in examination history to be honest.