Since I wasn't able to see what problems were the biggest issues so I created these videos to explain the solutions. They were made on the iPad, so they may be a little shaky.
Don't watch them all, just watch the ones you think will help you most. If you are having troubles with logs, you may want to watch the Kahn Academy video at the end.
With about 25 minutest to go in class you will take a quiz. So use your time wisely in the beginning of class.
Here is an explanation of the pressure problem... (The direct link should allow full screen if it doesn't work within the blog)
about 4 minutes, Link the video: http://youtu.be/eZd5yjZlZ2I
Here are the life expectancy problems (about 7 minutes) Link to the video: http://youtu.be/Z1_WXSIerrE
And the baseball salaries problem (note this one shows the work for logs at the end that were not discussed at the end of the life expectancy problem, about 8 minutes).
Link to the video http://youtu.be/DwaWkd94nGE
And finally not my video, this comes from the Kahn Acadmy
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