Here is me discussing question 2 of quiz 1.
Here is me working through question 1 of quiz 2. We had some technical difficulties with the video, so please forgive the chops. Hopefully I'll have a better video to replace this soon.
Here is Andre's video, uncut or edited, but it has all of my work from these two questions. (I actually haven't previewed the whole thing, so I'm assuming the end part is good.)