Have you ever tried to read a pdf that has been scanned sideways? Not fun, or good for your neck. The solution often is to print it out, but I learned how to fix it with Acrobat Pro, thanks to Beth Kranz! UWEC computers should all have Acrobat Pro. These instructions are pretty much the same on Mac and Windows.
First you need to open the sideways pdf in Acrobat Pro. Your default is probably Adobe Reader. Save the pdf somewhere on your computer, right click on it, and choose Open with - Adobe Acrobat. You can change the default to always open in Acrobat if you want.
Right click and choose Rotate Pages. Then determine which way they need to be rotated (clockwise or counterclockwise). Voila. Then go to File - Save As - PDF.