You can delete a slide in PowerPoint simply by right-clicking on it, or delete multiple slides by selecting them all ...
You can copy a slide in the PowerPoint app or online version, and then paste it somewhere else in the slideshow.
How-To Geek on MSN
How to Crop Pictures in Microsoft Word, Excel, and PowerPoint
To manually crop a picture in Microsoft Word, Excel, or PowerPoint, select it, and in the Picture Format tab on the ribbon, click the top half of the split "Crop" button.
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