I once found a way to drag a line, using your cursor, along the edge of an image that should be straight on your scanned PDF and that would straighten the entire image but now all I can find is the deskew button???
Hi MELISSA YORK,
Please let me know what version of Acrobat you are using.
You might refer the below mentioned link and see if this helps:
Straighten and Deskew PDF Pages in Acrobat XI
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