MS Power Point
How do you add degrees of transparency to shapes such as arrows, so that the slide background shows though?

All of above
Use the Transparency slider in the Format AutoShapes dialog box
Use the Set Transparent Color button on the Picture toolbar
Use #D style 4 button on the drawing toolbar

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MS Power Point
How to create additional Guide Lines?

by holding Ctrl key, click on existing Guide Line and drag
Additional Guide Lines cannot be created
by holding Alt key, click on existing Guide Line and drag
by holding Ctrl + Alt key, click on existing Guide Line and drag

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