Hi, I'm new and have a few problems that I'm beating my head over. Hopefully you all can help me understand. Thanks in advance!

Number 1:

Here's what I did with it, and where I ended up. I'm not really sure if I've messed up or just need to keep going forward. If I am on the right track...I can't figure out where to go next.

Number 2:

I'm pretty sure that I've made a dumb mistake on this one, probably an obvious one. Something doesn't feel right... Used partial fractions for the first bit.

Number 3:

Ok...I'm pretty sure this one starts with a substitution, but I'm totally lost with it. Help?

Again, thanks for looking over all of this, I hope it all makes sense.