Hi guys, this is just a basic maths incompetency. I hope someone can guide me forwards! (Slack biology student, delving into physics)

I can do (a) with no problems, and thus I can probably do the latter half of (b) and (c) without issue. My stumbling point is in actually rearranging the above equation to isolate the term I want. I have this:
http://img410.imageshack.us/img410/3239/hlea6.png [Broken]

- but I don't know how to get 't' where I want it! I've been googling how to manipulate powers properly, but no joy. What can I say... no maths since I was 16! :-)